Merge pull request #581 from bryanthaboi/dev

bug smashing on a saturday

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -40,6 +40,7 @@ body:
         - Windows
         - Linux
         - Android
+        - iOS
         - Multiple platforms
     validations:
       required: true

.github/workflows/release.yml

@@ -1,8 +1,8 @@
 name: Release
 
-# Builds the macOS, Windows, and Linux desktop apps, an Android APK, and the
-# Anbernic RG34XXSP (Stock OS 64-bit MOD / PortMaster) port on the self-hosted
-# Mac runner, and publishes them as a GitHub Release.
+# Builds the macOS, Windows, and Linux desktop apps, an Android APK, an iOS
+# IPA, and the Anbernic RG34XXSP (Stock OS 64-bit MOD / PortMaster) port on
+# the self-hosted Mac runner, and publishes them as a GitHub Release.
 #
 # Versioning:
 #   - First ever release is 0.1.0.
@@ -170,6 +170,15 @@ jobs:
           set -euo pipefail
           scripts/build_android.sh --version "${{ steps.ver.outputs.version }}"
 
+      - name: Build iOS
+        run: |
+          set -euo pipefail
+          # Device Release IPA; signs with the Apple Development identity on
+          # the runner (auto team detection). Users on other Apple IDs still
+          # re-sign or build via docs/ios-install.md.
+          scripts/build_ios.sh --fetch --device --release \
+            --version "${{ steps.ver.outputs.version }}"
+
       - name: Build Anbernic RG34XXSP port
         run: |
           set -euo pipefail
@@ -226,6 +235,10 @@ jobs:
           [ -n "$apk" ] || { echo "::error::no Android APK found under dist/android/debug"; exit 1; }
           cp "$apk" "$outdir/gen1recomp-${v}-android.apk"
 
+          ipa="dist/ios/gen1recomp.ipa"
+          [ -f "$ipa" ] || { echo "::error::$ipa not found (expected from scripts/build_ios.sh --device)"; exit 1; }
+          cp "$ipa" "$outdir/gen1recomp-${v}-ios.ipa"
+
           # Anbernic handheld port (suffix names the CFW it targets, so a
           # future RG35XX/other-CFW pack can ship alongside it).
           rg34="dist/rg34xxsp/gen1recomp-rg34xxsp-stockos64-mod.zip"
@@ -344,6 +357,7 @@ jobs:
             "dist/release/gen1recomp-${v}-windows.zip" \
             "dist/release/gen1recomp-${v}-linux.zip" \
             "dist/release/gen1recomp-${v}-android.apk" \
+            "dist/release/gen1recomp-${v}-ios.ipa" \
             "dist/release/gen1recomp-${v}-rg34xxsp-stockos64-mod.zip" \
             "dist/release/gen1recomp-${v}.love" \
             "dist/release/sha256sums.txt"

.gitignore

@@ -16,6 +16,7 @@ __pycache__/
 .*
 !.github/
 !.gitignore
+!.luacheckrc
 
 # Android build outputs / local SDK path / packaged payload (keep love-android sources)
 mobile/android/app/build/

.luacheckrc

@@ -0,0 +1,43 @@
+-- Static-analysis config for `luacheck` (https://luacheck.readthedocs.io).
+--
+-- Run it over the engine with:  luacheck src   (or scripts/lint.sh)
+--
+-- The point is a high-signal baseline: the categories left on are the ones
+-- that catch real defects -- undefined globals/locals (the class that hid a
+-- `music.volume` crash: applyVolume read a `state` that was still the nil
+-- global), unused values, unreachable code, redefinitions. The cosmetic
+-- categories the codebase deliberately lives with (a `self`/`dt` an
+-- interface requires but a given method ignores, documented empty
+-- fall-through branches, the odd long line) are muted so they don't drown
+-- the signal.
+
+std = "luajit"
+
+-- LÖVE exposes `love` as a mutable table: games assign their callbacks onto
+-- it (love.wheelmoved, love.run, ...), so it is a regular global, not
+-- read-only -- otherwise every callback registration reads as a violation.
+globals = { "love" }
+
+read_globals = {
+  "jit",
+  -- LuaJIT 2.1 ships table.unpack even though the bare 5.1 `table` std lacks
+  -- it; without this, every `table.unpack` reads as an undefined field.
+  table = { fields = { "unpack" } },
+}
+
+-- Vendored/native trees and the test suites have their own conventions.
+exclude_files = {
+  "mobile/",
+  "tests/",
+  "tools/save-editor/",
+}
+
+ignore = {
+  "212",  -- unused argument -- self/dt kept for a shared method signature
+  "213",  -- unused loop variable -- `for _, v in` where only v is wanted
+  "421",  -- shadowing a local -- deliberate re-use in a few tight scopes
+  "431",  -- shadowing an upvalue
+  "432",  -- shadowing an argument
+  "542",  -- empty if branch -- documented fall-throughs, not gaps
+  "631",  -- line is too long
+}

README.md

@@ -50,25 +50,26 @@ supplied by the player.
 
 
 This project does not include a ROM, emulate the Game Boy, transpile assembly,
-or download a disassembly. A canonical US Poke Red or Blue ROM is the only
-game content input.
+or download a disassembly. A canonical US Poke Red, Blue, or Yellow ROM is the
+only game content input.
 
 The ROM is verified, used during import, and then released from memory. It is
 not copied into the cache. Later launches load the private generated cache and
-do not ask for the ROM again. Red and Blue can both be imported and played
-side by side.
+do not ask for the ROM again. Red, Blue, and Yellow can all be imported and
+played side by side.
 
 ## Quick Start
 
-Open the desktop app. On first boot, choose your legally obtained `.gb` file
-or drop it onto the window. Import takes a few seconds and the game starts
-automatically.
+Open the desktop app. On first boot, choose your legally obtained `.gb` /
+`.gbc` file or drop it onto the window. Import takes a few seconds and the
+game starts automatically.
 
-Only the canonical 1 MiB US Red and Blue ROMs are accepted. The importer
-verifies SHA-1 before creating any game data:
+Only the canonical 1 MiB US Red, Blue, and Yellow ROMs are accepted. The
+importer verifies SHA-1 before creating any game data:
 
 - Red: `ea9bcae617fdf159b045185467ae58b2e4a48b9a`
 - Blue: `d7037c83e1ae5b39bde3c30787637ba1d4c48ce2`
+- Yellow: `cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1`
 
 The packaged app contains neither a ROM nor pre-extracted game data. Music,
 sound effects, and cries are synthesized while the game runs from compact
@@ -107,6 +108,17 @@ supported out of the box.
 COLORS, TILT, ZOOM, GBC FX, and VOID FILL are also in the Options menu
 and persist in `options.lua`.
 
+### Low-end devices
+
+**OPTIONS → PERFORMANCE** scales the port's optional extras for weaker
+hardware: **HIGH** (everything on), **BALANCED** (no 3D tilt or GBC FX),
+**LOW** (also no survey zoom, FPS capped), or **AUTO** — the default, which
+picks a tier from your device (ARM handhelds → LOW, phones → BALANCED,
+normal desktops → HIGH, unchanged). It only scales presentation; the
+fixed-step game logic is identical on every tier, and a lower tier hides
+your tilt/zoom/GBC-FX preferences without forgetting them. Details in
+[docs/new-features.md](docs/new-features.md#performance-tier-low-end-devices).
+
 ### Rulesets
 
 **OPTIONS → RULESET** picks which set of Gen 1 battle behaviors to run.
@@ -141,11 +153,11 @@ famous bugs included:
 
 ## Running From Source
 
-Requires LÖVE 11.x. Place a Red or Blue ROM in the project folder and
+Requires LÖVE 11.x. Place a Red, Blue, or Yellow ROM in the project folder and
 double-click `Play-Mac.command` or `Play-Windows.bat`, or run:
 
 ```sh
-scripts/setup.sh --rom "/path/to/Poke Red.gb"   # or Poke Blue.gb
+scripts/setup.sh --rom "/path/to/Poke Red.gb"   # or Blue.gb / Yellow.gbc
 scripts/run.sh
 ```
 
@@ -176,6 +188,13 @@ even on a different computer, as long as the same folder comes along.
 already written to either location is touched automatically, so copy files
 over yourself if you want to carry existing progress across the switch.
 
+## iOS
+
+Every release ships `gen1recomp-*-ios.ipa`. Sideload it with AltStore
+(Windows or Mac) — see [docs/ios-sideload.md](docs/ios-sideload.md). To
+build and install from source on a Mac instead, see
+[docs/ios-install.md](docs/ios-install.md).
+
 ## Handhelds
 
 A PortMaster-style port for the **Anbernic RG34XXSP** on Stock OS 64-bit MOD

conf.lua

@@ -1,4 +1,9 @@
 function love.conf(t)
+  -- PhysFS ignores symlinks unless told otherwise, so a mod dev-linked into
+  -- mods/ (ln -s, matching the mklink /J workflow on Windows) is invisible
+  -- to love.filesystem.getDirectoryItems without this.
+  love.filesystem.setSymlinksEnabled(true)
+
   local editor = os.getenv("POKEPORT_EDITOR") == "1"
   local developer = os.getenv("POKEPORT_DEV") == "1"
   if arg then
@@ -44,7 +49,7 @@ function love.conf(t)
     t.window.minwidth = 480
     t.window.minheight = 360
   end
-  t.version = "11.5"
+  t.version = love._os == "iOS" and "12.0" or "11.5"
   t.window.vsync = 1
   t.modules.joystick = true
   t.modules.physics = false
@@ -62,7 +67,10 @@ function love.conf(t)
     -- the game follow the device.  The renderer letterboxes the 160x144
     -- viewport into whatever size results, and the on-screen touch controls
     -- re-lay themselves out from the new window size, so both orientations
-    -- just work.  iOS follows the Info.plist orientations
+    -- just work.  FULL_SENSOR ignores the device's rotation lock, so
+    -- GameActivity.setOrientationBis remaps it to FULL_USER after SDL has
+    -- run: same orientations allowed, but auto-rotate being off now wins.
+    -- iOS follows the Info.plist orientations
     -- (see mobile/ios/overlays/love-ios.plist, now portrait + landscape).
     t.window.resizable = true
     -- Starting size is a tall portrait hint; the OS resizes to the real
@@ -78,6 +86,14 @@ function love.conf(t)
     -- player to copy their ROM there instead of needing a native file
     -- picker (LOVE 11.5 on Android has none -- see src/import/RomImporter.lua).
     t.externalstorage = osName == "Android"
+    -- LOVE 11.x exposes the phone's accelerometer as a 3-axis joystick by
+    -- default.  Gravity keeps one axis pinned near +/-1.0 whenever the phone
+    -- is held upright, so it streams past-deadzone joystickaxis events that
+    -- both hid the touch overlay every instant (it reads as "a controller is
+    -- in use") and, via the generic-joystick axis mapping (#459), walked the
+    -- player around by tilt.  Nothing in the game reads the accelerometer,
+    -- so drop the device entirely (#468).
+    t.accelerometerjoystick = false
   else
     t.window.resizable = true
   end

data/palettes_yellow.lua

@@ -0,0 +1,686 @@
+-- Generated by tools/build_data.py. DO NOT EDIT.
+-- Pokemon Yellow palettes (COLORS=OG YELLOW): SuperPalettes +
+-- CGBBasePalettes (authentic GBC look) as 4 8-bit RGB colors
+-- per palette (color 0 first), plus MonsterPalettes.
+return {
+  cgbBase = {
+    ["0F"] = {
+      { 255, 255, 255 },
+      { 107, 8, 255 },
+      { 0, 74, 255 },
+      { 8, 8, 8 },
+    },
+    BADGE = {
+      { 255, 255, 255 },
+      { 189, 66, 0 },
+      { 140, 115, 90 },
+      { 25, 25, 25 },
+    },
+    BLACK = {
+      { 255, 255, 255 },
+      { 25, 25, 25 },
+      { 25, 25, 25 },
+      { 25, 25, 25 },
+    },
+    BLUEMON = {
+      { 255, 255, 255 },
+      { 132, 148, 255 },
+      { 0, 8, 206 },
+      { 25, 25, 25 },
+    },
+    BROWNMON = {
+      { 255, 255, 255 },
+      { 239, 148, 82 },
+      { 140, 74, 41 },
+      { 25, 25, 25 },
+    },
+    CAVE = {
+      { 255, 255, 255 },
+      { 189, 66, 0 },
+      { 140, 115, 90 },
+      { 25, 25, 25 },
+    },
+    CELADON = {
+      { 255, 255, 255 },
+      { 41, 255, 41 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    CERULEAN = {
+      { 255, 255, 255 },
+      { 41, 66, 255 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    CINNABAR = {
+      { 255, 255, 255 },
+      { 255, 66, 66 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    CYANMON = {
+      { 255, 255, 255 },
+      { 132, 214, 255 },
+      { 0, 140, 255 },
+      { 25, 25, 25 },
+    },
+    FUCHSIA = {
+      { 255, 255, 255 },
+      { 255, 123, 123 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    GAMEFREAK = {
+      { 255, 255, 255 },
+      { 255, 156, 0 },
+      { 156, 156, 0 },
+      { 25, 25, 25 },
+    },
+    GRAYMON = {
+      { 255, 255, 255 },
+      { 165, 189, 82 },
+      { 90, 90, 41 },
+      { 25, 25, 25 },
+    },
+    GREENBAR = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 0, 255, 0 },
+      { 25, 25, 25 },
+    },
+    GREENMON = {
+      { 255, 255, 255 },
+      { 140, 255, 90 },
+      { 8, 181, 49 },
+      { 25, 25, 25 },
+    },
+    INDIGO = {
+      { 255, 255, 255 },
+      { 90, 66, 255 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    LAVENDER = {
+      { 255, 255, 255 },
+      { 206, 33, 255 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    LOGO1 = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 255, 0, 0 },
+      { 255, 0, 0 },
+    },
+    LOGO2 = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 58, 58, 206 },
+      { 0, 0, 140 },
+    },
+    MEWMON = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 255, 8, 8 },
+      { 25, 25, 25 },
+    },
+    PALLET = {
+      { 255, 255, 255 },
+      { 189, 140, 255 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    PEWTER = {
+      { 255, 255, 255 },
+      { 148, 148, 123 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    PIKACHUS_BEACH = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    PIKACHUS_BEACH_TITLE = {
+      { 255, 255, 255 },
+      { 74, 74, 74 },
+      { 255, 173, 0 },
+      { 25, 25, 25 },
+    },
+    PIKACHU_PORTRAIT = {
+      { 255, 255, 255 },
+      { 255, 148, 0 },
+      { 156, 58, 8 },
+      { 25, 25, 25 },
+    },
+    PINKMON = {
+      { 255, 255, 255 },
+      { 255, 123, 148 },
+      { 255, 0, 49 },
+      { 25, 25, 25 },
+    },
+    PURPLEMON = {
+      { 255, 255, 255 },
+      { 206, 123, 255 },
+      { 156, 0, 181 },
+      { 25, 25, 25 },
+    },
+    REDBAR = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 255, 0, 0 },
+      { 25, 25, 25 },
+    },
+    REDMON = {
+      { 255, 255, 255 },
+      { 255, 140, 0 },
+      { 255, 0, 0 },
+      { 25, 25, 25 },
+    },
+    ROUTE = {
+      { 255, 255, 255 },
+      { 132, 255, 33 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    SAFFRON = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    SLOTS1 = {
+      { 255, 255, 255 },
+      { 206, 8, 255 },
+      { 255, 0, 0 },
+      { 25, 25, 25 },
+    },
+    SLOTS2 = {
+      { 255, 255, 255 },
+      { 255, 33, 156 },
+      { 255, 255, 0 },
+      { 25, 25, 25 },
+    },
+    SLOTS3 = {
+      { 255, 255, 255 },
+      { 66, 255, 0 },
+      { 255, 255, 0 },
+      { 25, 25, 25 },
+    },
+    SLOTS4 = {
+      { 255, 255, 255 },
+      { 0, 255, 255 },
+      { 255, 255, 0 },
+      { 25, 25, 25 },
+    },
+    TOWNMAP = {
+      { 255, 255, 255 },
+      { 0, 173, 255 },
+      { 82, 230, 0 },
+      { 8, 8, 8 },
+    },
+    VERMILION = {
+      { 255, 255, 255 },
+      { 255, 156, 0 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    VIRIDIAN = {
+      { 255, 255, 255 },
+      { 156, 255, 0 },
+      { 90, 189, 255 },
+      { 25, 25, 25 },
+    },
+    YELLOWBAR = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 255, 148, 0 },
+      { 25, 25, 25 },
+    },
+    YELLOWMON = {
+      { 255, 255, 255 },
+      { 255, 255, 0 },
+      { 230, 115, 0 },
+      { 25, 25, 25 },
+    },
+  },
+  order = {
+    "ROUTE",
+    "PALLET",
+    "VIRIDIAN",
+    "PEWTER",
+    "CERULEAN",
+    "LAVENDER",
+    "VERMILION",
+    "CELADON",
+    "FUCHSIA",
+    "CINNABAR",
+    "INDIGO",
+    "SAFFRON",
+    "TOWNMAP",
+    "LOGO1",
+    "LOGO2",
+    "0F",
+    "MEWMON",
+    "BLUEMON",
+    "REDMON",
+    "CYANMON",
+    "PURPLEMON",
+    "BROWNMON",
+    "GREENMON",
+    "PINKMON",
+    "YELLOWMON",
+    "GRAYMON",
+    "SLOTS1",
+    "SLOTS2",
+    "SLOTS3",
+    "SLOTS4",
+    "BLACK",
+    "GREENBAR",
+    "YELLOWBAR",
+    "REDBAR",
+    "BADGE",
+    "CAVE",
+    "GAMEFREAK",
+    "PIKACHUS_BEACH",
+    "PIKACHU_PORTRAIT",
+    "PIKACHUS_BEACH_TITLE",
+  },
+  palettes = {
+    ["0F"] = {
+      { 255, 255, 247 },
+      { 197, 165, 247 },
+      { 90, 165, 247 },
+      { 25, 16, 16 },
+    },
+    BADGE = {
+      { 255, 255, 247 },
+      { 165, 123, 90 },
+      { 181, 173, 165 },
+      { 49, 49, 49 },
+    },
+    BLACK = {
+      { 255, 255, 247 },
+      { 49, 49, 49 },
+      { 49, 49, 49 },
+      { 49, 49, 49 },
+    },
+    BLUEMON = {
+      { 255, 255, 247 },
+      { 173, 181, 255 },
+      { 74, 82, 165 },
+      { 49, 49, 49 },
+    },
+    BROWNMON = {
+      { 255, 255, 247 },
+      { 214, 189, 148 },
+      { 148, 115, 82 },
+      { 49, 49, 49 },
+    },
+    CAVE = {
+      { 255, 255, 247 },
+      { 165, 123, 90 },
+      { 181, 173, 165 },
+      { 49, 49, 49 },
+    },
+    CELADON = {
+      { 255, 255, 247 },
+      { 181, 255, 181 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    CERULEAN = {
+      { 255, 255, 247 },
+      { 181, 189, 255 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    CINNABAR = {
+      { 255, 255, 247 },
+      { 255, 123, 115 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    CYANMON = {
+      { 255, 255, 247 },
+      { 214, 230, 255 },
+      { 58, 197, 230 },
+      { 49, 49, 49 },
+    },
+    FUCHSIA = {
+      { 255, 255, 247 },
+      { 255, 214, 214 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    GAMEFREAK = {
+      { 255, 255, 247 },
+      { 230, 197, 115 },
+      { 165, 165, 90 },
+      { 49, 49, 49 },
+    },
+    GRAYMON = {
+      { 255, 255, 247 },
+      { 206, 206, 148 },
+      { 132, 132, 115 },
+      { 49, 49, 49 },
+    },
+    GREENBAR = {
+      { 255, 255, 247 },
+      { 255, 255, 156 },
+      { 0, 173, 0 },
+      { 49, 49, 49 },
+    },
+    GREENMON = {
+      { 255, 255, 247 },
+      { 197, 230, 148 },
+      { 107, 173, 123 },
+      { 49, 49, 49 },
+    },
+    INDIGO = {
+      { 255, 255, 247 },
+      { 140, 140, 206 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    LAVENDER = {
+      { 255, 255, 247 },
+      { 222, 189, 239 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    LOGO1 = {
+      { 255, 255, 247 },
+      { 247, 247, 140 },
+      { 173, 0, 33 },
+      { 173, 0, 33 },
+    },
+    LOGO2 = {
+      { 255, 255, 247 },
+      { 247, 247, 140 },
+      { 148, 148, 197 },
+      { 58, 58, 132 },
+    },
+    MEWMON = {
+      { 255, 255, 247 },
+      { 255, 247, 181 },
+      { 222, 132, 132 },
+      { 49, 49, 49 },
+    },
+    PALLET = {
+      { 255, 255, 247 },
+      { 230, 222, 255 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    PEWTER = {
+      { 255, 255, 247 },
+      { 189, 189, 181 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    PIKACHUS_BEACH = {
+      { 255, 255, 247 },
+      { 255, 247, 181 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    PIKACHUS_BEACH_TITLE = {
+      { 255, 255, 247 },
+      { 132, 132, 132 },
+      { 255, 206, 74 },
+      { 49, 49, 49 },
+    },
+    PIKACHU_PORTRAIT = {
+      { 255, 255, 247 },
+      { 230, 189, 74 },
+      { 148, 115, 82 },
+      { 49, 49, 49 },
+    },
+    PINKMON = {
+      { 255, 255, 247 },
+      { 255, 197, 214 },
+      { 255, 148, 173 },
+      { 49, 49, 49 },
+    },
+    PURPLEMON = {
+      { 255, 255, 247 },
+      { 222, 181, 247 },
+      { 181, 123, 189 },
+      { 49, 49, 49 },
+    },
+    REDBAR = {
+      { 255, 255, 247 },
+      { 255, 255, 156 },
+      { 214, 74, 49 },
+      { 49, 49, 49 },
+    },
+    REDMON = {
+      { 255, 255, 247 },
+      { 255, 197, 90 },
+      { 214, 74, 49 },
+      { 49, 49, 49 },
+    },
+    ROUTE = {
+      { 255, 255, 247 },
+      { 189, 214, 156 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    SAFFRON = {
+      { 255, 255, 247 },
+      { 255, 255, 156 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    SLOTS1 = {
+      { 255, 255, 247 },
+      { 222, 181, 247 },
+      { 214, 74, 49 },
+      { 49, 49, 49 },
+    },
+    SLOTS2 = {
+      { 255, 255, 247 },
+      { 255, 189, 214 },
+      { 239, 239, 66 },
+      { 49, 49, 49 },
+    },
+    SLOTS3 = {
+      { 255, 255, 247 },
+      { 189, 255, 165 },
+      { 239, 239, 66 },
+      { 49, 49, 49 },
+    },
+    SLOTS4 = {
+      { 255, 255, 247 },
+      { 189, 239, 255 },
+      { 239, 239, 66 },
+      { 49, 49, 49 },
+    },
+    TOWNMAP = {
+      { 255, 255, 247 },
+      { 165, 214, 255 },
+      { 140, 189, 82 },
+      { 25, 16, 16 },
+    },
+    VERMILION = {
+      { 255, 255, 247 },
+      { 255, 206, 132 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    VIRIDIAN = {
+      { 255, 255, 247 },
+      { 214, 255, 173 },
+      { 189, 222, 255 },
+      { 49, 49, 49 },
+    },
+    YELLOWBAR = {
+      { 255, 255, 247 },
+      { 255, 255, 156 },
+      { 230, 189, 74 },
+      { 49, 49, 49 },
+    },
+    YELLOWMON = {
+      { 255, 255, 247 },
+      { 255, 255, 156 },
+      { 230, 189, 74 },
+      { 49, 49, 49 },
+    },
+  },
+  pokemon = {
+    ABRA = "YELLOWMON",
+    AERODACTYL = "GRAYMON",
+    ALAKAZAM = "YELLOWMON",
+    ARBOK = "PURPLEMON",
+    ARCANINE = "REDMON",
+    ARTICUNO = "BLUEMON",
+    BEEDRILL = "YELLOWMON",
+    BELLSPROUT = "GREENMON",
+    BLASTOISE = "CYANMON",
+    BULBASAUR = "GREENMON",
+    BUTTERFREE = "CYANMON",
+    CATERPIE = "GREENMON",
+    CHANSEY = "PINKMON",
+    CHARIZARD = "REDMON",
+    CHARMANDER = "REDMON",
+    CHARMELEON = "REDMON",
+    CLEFABLE = "PINKMON",
+    CLEFAIRY = "PINKMON",
+    CLOYSTER = "GRAYMON",
+    CUBONE = "GRAYMON",
+    DEWGONG = "BLUEMON",
+    DIGLETT = "BROWNMON",
+    DITTO = "GRAYMON",
+    DODRIO = "BROWNMON",
+    DODUO = "BROWNMON",
+    DRAGONAIR = "BLUEMON",
+    DRAGONITE = "BROWNMON",
+    DRATINI = "GRAYMON",
+    DROWZEE = "YELLOWMON",
+    DUGTRIO = "BROWNMON",
+    EEVEE = "GRAYMON",
+    EKANS = "PURPLEMON",
+    ELECTABUZZ = "YELLOWMON",
+    ELECTRODE = "YELLOWMON",
+    EXEGGCUTE = "PINKMON",
+    EXEGGUTOR = "GREENMON",
+    FARFETCHD = "BROWNMON",
+    FEAROW = "BROWNMON",
+    FLAREON = "REDMON",
+    GASTLY = "PURPLEMON",
+    GENGAR = "PURPLEMON",
+    GEODUDE = "GRAYMON",
+    GLOOM = "REDMON",
+    GOLBAT = "BLUEMON",
+    GOLDEEN = "REDMON",
+    GOLDUCK = "CYANMON",
+    GOLEM = "GRAYMON",
+    GRAVELER = "GRAYMON",
+    GRIMER = "PURPLEMON",
+    GROWLITHE = "BROWNMON",
+    GYARADOS = "BLUEMON",
+    HAUNTER = "PURPLEMON",
+    HITMONCHAN = "BROWNMON",
+    HITMONLEE = "BROWNMON",
+    HORSEA = "CYANMON",
+    HYPNO = "YELLOWMON",
+    IVYSAUR = "GREENMON",
+    JIGGLYPUFF = "PINKMON",
+    JOLTEON = "YELLOWMON",
+    JYNX = "MEWMON",
+    KABUTO = "BROWNMON",
+    KABUTOPS = "BROWNMON",
+    KADABRA = "YELLOWMON",
+    KAKUNA = "YELLOWMON",
+    KANGASKHAN = "BROWNMON",
+    KINGLER = "REDMON",
+    KOFFING = "PURPLEMON",
+    KRABBY = "REDMON",
+    LAPRAS = "CYANMON",
+    LICKITUNG = "PINKMON",
+    MACHAMP = "GRAYMON",
+    MACHOKE = "GRAYMON",
+    MACHOP = "GRAYMON",
+    MAGIKARP = "REDMON",
+    MAGMAR = "REDMON",
+    MAGNEMITE = "GRAYMON",
+    MAGNETON = "GRAYMON",
+    MANKEY = "BROWNMON",
+    MAROWAK = "GRAYMON",
+    MEOWTH = "YELLOWMON",
+    METAPOD = "GREENMON",
+    MEW = "MEWMON",
+    MEWTWO = "MEWMON",
+    MOLTRES = "REDMON",
+    MR_MIME = "PINKMON",
+    MUK = "PURPLEMON",
+    NIDOKING = "PURPLEMON",
+    NIDOQUEEN = "BLUEMON",
+    NIDORAN_F = "BLUEMON",
+    NIDORAN_M = "PURPLEMON",
+    NIDORINA = "BLUEMON",
+    NIDORINO = "PURPLEMON",
+    NINETALES = "YELLOWMON",
+    ODDISH = "GREENMON",
+    OMANYTE = "BLUEMON",
+    OMASTAR = "BLUEMON",
+    ONIX = "GRAYMON",
+    PARAS = "REDMON",
+    PARASECT = "REDMON",
+    PERSIAN = "YELLOWMON",
+    PIDGEOT = "BROWNMON",
+    PIDGEOTTO = "BROWNMON",
+    PIDGEY = "BROWNMON",
+    PIKACHU = "YELLOWMON",
+    PINSIR = "BROWNMON",
+    POLIWAG = "BLUEMON",
+    POLIWHIRL = "BLUEMON",
+    POLIWRATH = "BLUEMON",
+    PONYTA = "REDMON",
+    PORYGON = "GRAYMON",
+    PRIMEAPE = "BROWNMON",
+    PSYDUCK = "YELLOWMON",
+    RAICHU = "YELLOWMON",
+    RAPIDASH = "REDMON",
+    RATICATE = "GRAYMON",
+    RATTATA = "GRAYMON",
+    RHYDON = "GRAYMON",
+    RHYHORN = "GRAYMON",
+    SANDSHREW = "BROWNMON",
+    SANDSLASH = "BROWNMON",
+    SCYTHER = "GREENMON",
+    SEADRA = "CYANMON",
+    SEAKING = "REDMON",
+    SEEL = "BLUEMON",
+    SHELLDER = "GRAYMON",
+    SLOWBRO = "PINKMON",
+    SLOWPOKE = "PINKMON",
+    SNORLAX = "PINKMON",
+    SPEAROW = "BROWNMON",
+    SQUIRTLE = "CYANMON",
+    STARMIE = "GRAYMON",
+    STARYU = "REDMON",
+    TANGELA = "BLUEMON",
+    TAUROS = "GRAYMON",
+    TENTACOOL = "CYANMON",
+    TENTACRUEL = "CYANMON",
+    VAPOREON = "CYANMON",
+    VENOMOTH = "PURPLEMON",
+    VENONAT = "PURPLEMON",
+    VENUSAUR = "GREENMON",
+    VICTREEBEL = "GREENMON",
+    VILEPLUME = "REDMON",
+    VOLTORB = "YELLOWMON",
+    VULPIX = "REDMON",
+    WARTORTLE = "CYANMON",
+    WEEDLE = "YELLOWMON",
+    WEEPINBELL = "GREENMON",
+    WEEZING = "PURPLEMON",
+    WIGGLYTUFF = "PINKMON",
+    ZAPDOS = "YELLOWMON",
+    ZUBAT = "BLUEMON",
+  },
+  source = "pokeyellow data/sgb/sgb_palettes.asm + data/pokemon/palettes.asm",
+}

data/scripts/flavor/bike_shop.lua

@@ -1,10 +1,9 @@
 -- BikeShop (BIKE_SHOP) flavor dialogue
 -- Source: pokered/scripts/BikeShop.asm, pokered/text/BikeShop.asm
 --
--- TEXT_BIKESHOP_CLERK is skipped: it drives the actual voucher-for-bicycle
--- exchange (YesNoChoice purchase menu, GiveItem, RemoveItemByID, SetEvent
--- EVENT_GOT_BICYCLE). That is a significant standalone feature outside the
--- scope of these two flavor NPCs and is left unported here.
+-- TEXT_BIKESHOP_CLERK lives in data/scripts/story2.lua (M.BIKE_SHOP): the
+-- voucher exchange and the BICYCLE/CANCEL price window need more than
+-- command rows (#568).
 
 return {
   BIKE_SHOP = {
@@ -20,12 +19,15 @@ return {
       -- CheckEvent EVENT_GOT_BICYCLE ; jr nz, .gotBike
       -- before the player owns a bike -> TheseBikesAreExpensiveText
       -- after the player owns a bike  -> CoolBikeText
+      -- The check reads the bag, not the event: the port hands out the
+      -- BICYCLE itself (a key item, so it cannot be tossed), and that also
+      -- reads right on saves written before the clerk set the event (#567).
       TEXT_BIKESHOP_YOUNGSTER = {
         { "face_player" },                                            -- 1
-        { "check_flag", "EVENT_GOT_BICYCLE" },                        -- 2
-        { "jump_if_true", 5 },                                        -- 3
+        { "check_item", "BICYCLE" },                                  -- 2
+        { "jump_if_true", 6 },                                        -- 3
         { "show_text", "_BikeShopYoungsterTheseBikesAreExpensiveText" }, -- 4
-        { "jump", 6 },                                                -- 5
+        { "jump", "end" },                                            -- 5
         { "show_text", "_BikeShopYoungsterCoolBikeText" },            -- 6
       },
     },

data/scripts/flavor/cerulean_badge_house.lua

@@ -35,13 +35,25 @@ local function middleAgedMan(game, ow, npc, done)
     -- .loop: print WhichBadgeText, then show the badge list menu again
     push(game, t._CeruleanBadgeHouseMiddleAgedManWhichBadgeText, function()
       local ListMenu = require("src.ui.ListMenu")
+      local Strings = require("src.core.Strings")
       local items = {}
       for _, id in ipairs(BADGE_ORDER) do
         local idef = game.data.items[id]
         items[#items + 1] = { label = idef and idef.name or id, value = id }
       end
+      -- PrintListMenuEntries prints ListMenuCancelText once it hits the
+      -- list's $FF terminator (home/list_menu.asm), so every
+      -- DisplayListMenuID list ends in an on-screen CANCEL row; picking it
+      -- takes DisplayListMenuIDLoop's ExitListMenu path, the same .done
+      -- exit as B (#569)
+      items[#items + 1] = { label = Strings("CANCEL") }
       local menu = ListMenu.new(game, "", items, {
         onChoose = function(item)
+          game.stack:pop()
+          if not item.value then
+            push(game, t._CeruleanBadgeHouseMiddleAgedManVisitAnyTimeText, done)
+            return
+          end
           push(game, t[BADGE_TEXT[item.value]], loop)
         end,
         onCancel = function()

data/scripts/flavor/cerulean_city.lua

@@ -3,6 +3,10 @@
 -- Both NPCs use text_asm with an hRandomAdd roll to pick one of several
 -- flavor lines (no flags, no branching outcome) -- ported as a weighted
 -- math.random pick each time the NPC is talked to.
+--
+-- Yellow renames Slowbro -> Electrode in the text labels (see
+-- tools/yellow_symbol_aliases.py); look up both so Red/Blue and Yellow
+-- share this script.
 
 local M = {}
 
@@ -12,6 +16,29 @@ local function push(game, ow, npc, done, text)
   game.stack:push(TextBox.new(game, text, done))
 end
 
+-- CeruleanCitySlowbroText / CeruleanCityElectrodeText
+-- cp 180 -> 76/256 chance of 1st; cp 120 -> 60/256 chance of 2nd;
+-- cp 60 -> 60/256 chance of 3rd; else 60/256 chance of 4th.
+local function talkMon(game, ow, npc, done)
+  local t = game.data.text
+  local roll = math.random(0, 255)
+  local text
+  if roll >= 180 then
+    text = t._CeruleanCitySlowbroTookASnoozeText
+        or t._CeruleanCityElectrodeTookASnoozeText
+  elseif roll >= 120 then
+    text = t._CeruleanCitySlowbroIsLoafingAroundText
+        or t._CeruleanCityElectrodeIsLoafingAroundText
+  elseif roll >= 60 then
+    text = t._CeruleanCitySlowbroTurnedAwayText
+        or t._CeruleanCityElectrodeTurnedAwayText
+  else
+    text = t._CeruleanCitySlowbroIgnoredOrdersText
+        or t._CeruleanCityElectrodeIgnoredOrdersText
+  end
+  push(game, ow, npc, done, text)
+end
+
 M.CERULEAN_CITY = {
   talk = {
     -- CeruleanCityCooltrainerF1Text (scripts/CeruleanCity.asm:362-393)
@@ -23,32 +50,20 @@ M.CERULEAN_CITY = {
       local text
       if roll >= 180 then
         text = t._CeruleanCityCooltrainerF1SlowbroUseSonicboomText
+            or t._CeruleanCityCooltrainerF1ElectrodeUseSonicboomText
       elseif roll >= 100 then
         text = t._CeruleanCityCooltrainerF1SlowbroPunchText
+            or t._CeruleanCityCooltrainerF1ElectrodePunchText
       else
         text = t._CeruleanCityCooltrainerF1SlowbroWithdrawText
+            or t._CeruleanCityCooltrainerF1ElectrodeWithdrawText
       end
       push(game, ow, npc, done, text)
     end,
 
-    -- CeruleanCitySlowbroText (scripts/CeruleanCity.asm:395-436)
-    -- cp 180 -> 76/256 chance of 1st; cp 120 -> 60/256 chance of 2nd;
-    -- cp 60 -> 60/256 chance of 3rd; else 60/256 chance of 4th.
-    TEXT_CERULEANCITY_SLOWBRO = function(game, ow, npc, done)
-      local t = game.data.text
-      local roll = math.random(0, 255)
-      local text
-      if roll >= 180 then
-        text = t._CeruleanCitySlowbroTookASnoozeText
-      elseif roll >= 120 then
-        text = t._CeruleanCitySlowbroIsLoafingAroundText
-      elseif roll >= 60 then
-        text = t._CeruleanCitySlowbroTurnedAwayText
-      else
-        text = t._CeruleanCitySlowbroIgnoredOrdersText
-      end
-      push(game, ow, npc, done, text)
-    end,
+    TEXT_CERULEANCITY_SLOWBRO = talkMon,
+    -- Yellow map object uses TEXT_CERULEANCITY_ELECTRODE
+    TEXT_CERULEANCITY_ELECTRODE = talkMon,
   },
 }
 

data/scripts/flavor/game_corner.lua

@@ -85,6 +85,47 @@ return {
         alreadyGotLabel = "_GameCornerGentlemanCloselyWatchTheReelsText",
         alreadyGotFallback = "The trick is to\nwatch the reels\vclosely!",
       }),
+
+      -- Yellow keeps all three giveaways with the same events and amounts
+      -- but renames the objects and their text labels: FISHING_GURU ->
+      -- FISHING_GURU1, CLERK2 -> MIDDLE_AGED_MAN2, GENTLEMAN ->
+      -- FISHING_GURU2 (pokeyellow/scripts/GameCorner.asm).  The Red/Blue
+      -- keys above never match there, so Yellow needs its own three (#552).
+      TEXT_GAMECORNER_FISHING_GURU1 = coinGiver({
+        event = "EVENT_GOT_10_COINS",
+        amount = 10,
+        askLabel = "_GameCornerFishingGuru1WantToPlayText",
+        askFallback = "Kid, do you want\nto play?",
+        receivedLabel = "_GameCornerFishingGuru1Received10CoinsText",
+        coinCaseFullLabel = "_GameCornerFishingGuru1DontNeedMyCoinsText",
+        coinCaseFullFallback = "You don't need my\ncoins!",
+        alreadyGotLabel = "_GameCornerFishingGuru1WinsComeAndGoText",
+        alreadyGotFallback = "Wins seem to come\nand go.",
+      }),
+
+      TEXT_GAMECORNER_MIDDLE_AGED_MAN2 = coinGiver({
+        event = "EVENT_GOT_20_COINS_2",
+        amount = 20,
+        askLabel = "_GameCornerMiddleAgedMan2WantSomeCoinsText",
+        askFallback = "What's up? Want\nsome coins?",
+        receivedLabel = "_GameCornerMiddleAgedMan2Received20CoinsText",
+        coinCaseFullLabel = "_GameCornerMiddleAgedMan2YouHaveLotsOfCoinsText",
+        coinCaseFullFallback = "You have lots of\ncoins!",
+        alreadyGotLabel = "_GameCornerMiddleAgedMan2INeedMoreCoinsText",
+        alreadyGotFallback = "Darn! I need more\ncoins for the\vPOKéMON I want!",
+      }),
+
+      TEXT_GAMECORNER_FISHING_GURU2 = coinGiver({
+        event = "EVENT_GOT_20_COINS",
+        amount = 20,
+        askLabel = "_GameCornerFishingGuru2ThrowingMeOffText",
+        askFallback = "Hey, what? You're\nthrowing me off!\vHere are some\vcoins, shoo!",
+        receivedLabel = "_GameCornerFishingGuru2Received20CoinsText",
+        coinCaseFullLabel = "_GameCornerFishingGuru2YouGotYourOwnCoinsText",
+        coinCaseFullFallback = "You've got your\nown coins!",
+        alreadyGotLabel = "_GameCornerFishingGuru2CloselyWatchTheReelsText",
+        alreadyGotFallback = "The trick is to\nwatch the reels\vclosely!",
+      }),
     },
   },
 }

data/scripts/flavor/viridian_school_house.lua

@@ -0,0 +1,95 @@
+-- Viridian School House's two readables (data/events/hidden_events.asm,
+-- hidden_events_for VIRIDIAN_SCHOOL_HOUSE):
+--   hidden_text_predef 3, 0  PrintBlackboardLinkCableText, ViridianSchoolBlackboard
+--   hidden_text_predef 3, 4  PrintNotebookText, ViridianSchoolNotebook
+-- tools/extract/field.py only parses `hidden_event` rows, so neither
+-- hidden_text_predef row reaches data/generated/field.lua and both tiles
+-- were dead A presses (#503).  Same hook shape, and the same sibling asm
+-- file, as the Celadon roof house in data/scripts/celadon_eevee.lua (#391);
+-- hidden_text_predef spends the facing byte on the tx_pre id, so neither
+-- tile gates on facing.
+
+local Menu = require("src.ui.Menu")
+local TextBox = require("src.render.TextBox")
+
+-- ViridianSchoolBlackboard (engine/events/hidden_events/school_blackboard.asm):
+-- StatusAilmentText1/2 are the two columns of the 12x8 box at the top left
+-- (hlcoord 0, 0 + `lb bc, 6, 10`); picking a status prints its
+-- ViridianBlackboardStatusPointers entry and jumps back to .blackboardLoop,
+-- QUIT or B falls through to .exitBlackboard.
+local STATUS_LABELS = {
+  { " SLP", "_ViridianBlackboardSleepText" },
+  { " PSN", "_ViridianBlackboardPoisonText" },
+  { " PAR", "_ViridianBlackboardPrlzText" },
+  { " BRN", "_ViridianBlackboardBurnText" },
+  { " FRZ", "_ViridianBlackboardFrozenText" },
+}
+
+local function blackboard(game)
+  local text = game.data.text or {}
+  local items, showMenu, askHeading
+  function showMenu()
+    game.stack:push(Menu.new(game, items,
+      { tx = 0, ty = 0, tw = 12, th = 8, rowStep = 1 }))
+  end
+  -- ViridianSchoolBlackboardText2 is reprinted on every .blackboardLoop
+  -- pass, immediately before HandleMenuInput
+  function askHeading()
+    game.stack:push(TextBox.new(game,
+      text._ViridianSchoolBlackboardText2 or "Which heading do\nyou want to read?",
+      showMenu))
+  end
+  items = {}
+  for i, row in ipairs(STATUS_LABELS) do
+    local label, key = row[1], row[2]
+    items[i] = { label = label, onSelect = function()
+      game.stack:push(TextBox.new(game, text[key] or label, askHeading))
+    end }
+  end
+  -- no onSelect: Menu's own pop closes the box, matching .exitBlackboard
+  items[#items + 1] = { label = " QUIT" }
+  game.stack:push(TextBox.new(game,
+    text._ViridianSchoolBlackboardText1
+      or "The blackboard\ndescribes POKéMON\vSTATUS changes\vduring battles.",
+    askHeading))
+end
+
+-- ViridianSchoolNotebook (engine/events/hidden_events/school_notebooks.asm):
+-- pages 1-3 each end in TurnPageSchoolNotebook (TurnPageText + YesNoChoice)
+-- and NO stops the read; page 4 turns without asking and runs straight into
+-- page 5, the girl catching you at it.
+local function notebook(game)
+  local text = game.data.text or {}
+  local function page(n, after)
+    return TextBox.new(game, text["_ViridianSchoolNotebookText" .. n] or "", after)
+  end
+  local function turnPage(nextPage)
+    return function()
+      game.stack:push(TextBox.new(game, text._TurnPageText or "Turn the page?",
+        nil, { choice = function(yes)
+          if yes then game.stack:push(nextPage()) end
+        end }))
+    end
+  end
+  local function page5() return page(5) end
+  local function page4() return page(4, function() game.stack:push(page5()) end) end
+  local function page3() return page(3, turnPage(page4)) end
+  local function page2() return page(2, turnPage(page3)) end
+  game.stack:push(page(1, turnPage(page2)))
+end
+
+return {
+  VIRIDIAN_SCHOOL_HOUSE = {
+    onInteract = function(game, ow, fx, fy)
+      if fx == 3 and fy == 0 then
+        blackboard(game)
+        return true
+      end
+      if fx == 3 and fy == 4 then
+        notebook(game)
+        return true
+      end
+      return false
+    end,
+  },
+}

data/scripts/flavor_all.lua

@@ -60,6 +60,7 @@ local files = {
   "data.scripts.flavor.victory_road_2f",
   "data.scripts.flavor.viridian_city",
   "data.scripts.flavor.viridian_nickname_house",
+  "data.scripts.flavor.viridian_school_house", -- #503
   "data.scripts.flavor.wardens_house",
 }
 

data/scripts/oaks_lab_yellow.lua

@@ -143,17 +143,25 @@ return {
         -- OaksLabRivalExclamationScript: "!" over the rival
         { "emote", RIVAL, "shock" },
       }
-      -- .RivalPushesPlayerAwayFromEeveeBall + the PAD_RIGHT x2 shove:
-      -- the rival cuts across to the ball WHILE the player standing
-      -- below it is bumped two tiles right (both movements run in the
-      -- same beat, so the walk overlaps the shove like the original)
+      -- .RivalPushesPlayerAwayFromEeveeBall is DOWN then RIGHT x3 (the $07
+      -- bytes are Yellow's own step-right encoding, decoded by
+      -- engine/overworld/movement.asm Func_5288 -> Func_532b), and the
+      -- PAD_RIGHT x2 shove is NOT queued alongside it:
+      -- OaksLabRivalTakesPokeballScript .asm_1c564 polls every frame and
+      -- only simulates the pair once wNPCNumScriptedSteps reads 1 -- i.e.
+      -- as the rival begins the LAST byte, the step onto the tile the
+      -- player is standing on.  Starting both on one row had Red stroll
+      -- off the Eevee while the rival was still at the top of the table
+      -- (#559).
       if py == 4 then
-        rows[#rows + 1] = { "walk_npc", RIVAL,
-          { "down", "right", "right", "right" }, { wait = false } }
+        rows[#rows + 1] = { "walk_npc", RIVAL, { "down", "right", "right" } }
+        -- this one runs concurrently with the shove below
+        rows[#rows + 1] = { "walk_npc", RIVAL, { "right" }, { wait = false } }
         rows[#rows + 1] = { "face_player_dir", "left" }
         rows[#rows + 1] = { "move_player", "right", 2 }
-        -- let the rival finish the last stretch to (7,4)
-        rows[#rows + 1] = { "wait", 40 }
+        -- move_player blocks for both tiles, so the rival has already
+        -- landed on (7,4); this is just the beat before he turns up
+        rows[#rows + 1] = { "wait", 20 }
       else
         rows[#rows + 1] = { "move_npc_to", RIVAL, 7, 4 }
       end

data/scripts/story.lua

@@ -183,6 +183,7 @@ M.BILLS_HOUSE = {
                                    overworld = ow },
                                  "BILLS_HOUSE", "BILLSHOUSE_BILL_POKEMON")
             game.save.flags.EVENT_BILL_SAID_USE_CELL_SEPARATOR = true
+            require("src.world.PikachuFollower").onBillEnteredMachine(game, ow)
             done()
           end
           if ow.player.facing == "down" then
@@ -273,6 +274,9 @@ M.BILLS_HOUSE = {
       Commands.hide_object(ctx, "BILLS_HOUSE", "BILLSHOUSE_BILL1")
       Commands.show_object(ctx, "BILLS_HOUSE", "BILLSHOUSE_BILL2")
     end
+    if not flags.EVENT_MET_BILL_2 then
+      require("src.world.PikachuFollower").onBillsHouseEnter(game, ow)
+    end
   end,
 }
 
@@ -643,7 +647,12 @@ M.WARDENS_HOUSE = {
     TEXT_WARDENSHOUSE_WARDEN = {
       { "face_player" },                                             -- 1
       { "check_flag", "EVENT_GOT_HM04" },                            -- 2
-      { "jump_if_true", 13 },                                        -- 3
+      -- #535: previously jumped to the same silent-end target as the
+      -- give-then-thank fallthrough (row 13), so the warden said nothing
+      -- on every visit after the trade. pokered's .got_item branch
+      -- (scripts/WardensHouse.asm) instead prints HM04ExplanationText,
+      -- so route here to the new row 17 that does the same.
+      { "jump_if_true", 17 },                                        -- 3
       { "check_item", "GOLD_TEETH" },                                -- 4
       { "jump_if_false", 15 },                                       -- 5
       { "show_text", "_WardensHouseWardenGaveTheGoldTeethText" },    -- 6
@@ -654,9 +663,15 @@ M.WARDENS_HOUSE = {
       { "give_item", "HM_STRENGTH", 1, false },                      -- 10
       { "show_text", "_WardensHouseWardenReceivedHM04Text" },        -- 11
       { "set_flag", "EVENT_GOT_HM04" },                              -- 12
-      { "jump", 16 },                                                -- 13 (already got it)
-      { "jump", 16 },                                                -- 14 (unused)
+      { "jump", 18 },                                                -- 13 (already got it this convo; jp .done)
+      { "jump", 18 },                                                -- 14 (unused)
       { "show_text", "_WardensHouseWardenGibberish1Text" },          -- 15
+      { "jump", 18 },                                                -- 16 (#535: skip the new explanation row below)
+      -- #535: pokered .got_item branch (scripts/WardensHouse.asm) --
+      -- printed on every subsequent talk once EVENT_GOT_HM04 is set.
+      -- Text is _WardensHouseWardenHM04ExplanationText (text/WardensHouse.asm):
+      -- HM04 teaches Strength, and hints at the Safari Zone secret house.
+      { "show_text", "_WardensHouseWardenHM04ExplanationText" },     -- 17
     },
   },
 }

data/scripts/story2.lua

@@ -413,22 +413,141 @@ M.POKEMON_FAN_CLUB = {
   },
 }
 
+-- BikeShopClerkText (scripts/BikeShop.asm) runs three ways: the BICYCLE is
+-- already yours, you are carrying the BIKE VOUCHER, or you get the sales
+-- pitch.  The pitch draws its own window (TextBoxBorder hlcoord 0,0, b=4
+-- c=15) holding BikeShopMenuText and BikeShopMenuPrice, and leaves it up
+-- while the clerk keeps talking in the bottom box: the original never
+-- erases it before TextScriptEnd (#568).
+local BikeShopWindow = {}
+BikeShopWindow.__index = BikeShopWindow
+
+function BikeShopWindow.new(game, footer, onChoose)
+  local self = setmetatable({}, BikeShopWindow)
+  self.game = game
+  self.onChoose = onChoose
+  self.index = 1
+  self.active = true
+  -- BikeShopClerkDoYouLikeItText stays on screen under the window for as
+  -- long as the menu is up.  The text box pushed on top types it out and
+  -- pops itself; this copy of its last page takes over from there, so the
+  -- bottom box never blanks between the pitch and the answer.  Paginated
+  -- with the themed column budget so the copy breaks where the box did.
+  local TextBox = require("src.render.TextBox")
+  local box = require("src.ui.Theme").textBox or {}
+  local pages = TextBox.paginate(TextBox.substitute(game, footer), box.maxCols)
+  self.footer = pages[#pages]
+  return self
+end
+
+function BikeShopWindow:update()
+  -- one answer only: the boxes pushed by onChoose sit on top of this
+  -- state, but a second A on the same frame must not fire it twice
+  if not self.active then return end
+  local input = self.game.input
+  -- HandleMenuInput with wMenuWrappingEnabled clear: the two rows clamp
+  if input:wasPressed("up") then
+    self.index = 1
+  elseif input:wasPressed("down") then
+    self.index = 2
+  elseif input:wasPressed("a") or input:wasPressed("b") then
+    local cancelled = input:wasPressed("b") -- bit B_PAD_B -> .cancel
+    require("src.core.Sound").play(self.game.data, "Press_AB")
+    self.active = false
+    self.onChoose(not cancelled and self.index == 1)
+  end
+end
+
+function BikeShopWindow:draw()
+  local Font = require("src.render.Font")
+  local Strings = require("src.core.Strings")
+  local Theme = require("src.ui.Theme")
+  Font.drawBox(0, 0, 17, 6)
+  love.graphics.setColor(0, 0, 0, 1)
+  local bike = self.game.data.items.BICYCLE
+  Font.draw(bike and bike.name or "BICYCLE", 16, 16)  -- hlcoord 2, 2
+  Font.draw("¥1000000", 64, 24)                       -- hlcoord 8, 3
+  Font.draw(Strings("CANCEL"), 16, 32)                -- `next` skips a row
+  -- wTopMenuItemX 1, wTopMenuItemY 2, rows two apart
+  Font.drawCode(Theme.cursor, 8, self.index == 1 and 16 or 32)
+  if self.footer then
+    -- same geometry TextBox resolves against, so a themed box matches
+    local box = Theme.textBox or {}
+    local tx, ty = box.tx or 0, box.ty or 12
+    love.graphics.setColor(1, 1, 1, 1)
+    Font.drawBox(tx, ty, box.tw or 20, box.th or 6)
+    love.graphics.setColor(0, 0, 0, 1)
+    for i, line in ipairs(self.footer) do
+      Font.draw(line, (tx + 1) * 8, (ty + 2 * i) * 8)
+    end
+  end
+  love.graphics.setColor(1, 1, 1, 1)
+end
+
 M.BIKE_SHOP = {
   talk = {
     TEXT_BIKESHOP_CLERK = function(game, ow, npc, done)
+      local Bag = require("src.inventory.Bag")
+      local Flags = require("src.script.Flags")
       local TextBox = require("src.render.TextBox")
-      if (game.save.inventory.BICYCLE or 0) > 0 then
-        game.stack:push(TextBox.new(game, "How's the\nBICYCLE treating\nyou?", done))
-      elseif (game.save.inventory.BIKE_VOUCHER or 0) > 0 then
-        game.save.inventory.BIKE_VOUCHER = nil
-        game.save.inventory.BICYCLE = 1
-        game.stack:push(TextBox.new(game,
-          ("Oh, that's a\nBIKE VOUCHER!\f%s exchanged\nit for a BICYCLE!")
-          :format(game.save.player.name), done))
-      else
-        game.stack:push(TextBox.new(game,
-          "A BICYCLE costs\n¥1000000. Sorry,\nno instalments!", done))
+      local t = game.data.text
+      local function say(text, after, opts)
+        game.stack:push(TextBox.new(game, text, after, opts))
       end
+
+      -- CheckEvent EVENT_GOT_BICYCLE.  Saves made before the clerk started
+      -- setting the event still have the bike in the bag, so either counts.
+      if (game.save.inventory.BICYCLE or 0) > 0
+          or Flags.get(game.save, "EVENT_GOT_BICYCLE") then
+        say(t._BikeShopClerkHowDoYouLikeYourBicycleText, done)
+        return
+      end
+
+      -- .dontHaveBike: IsItemInBag BIKE_VOUCHER
+      if (game.save.inventory.BIKE_VOUCHER or 0) > 0 then
+        say(t._BikeShopClerkOhThatsAVoucherText, function()
+          -- GiveItem's `jr nc, .BagFull`: the voucher is only spent once
+          -- the BICYCLE is actually in the bag
+          if not Bag.add(game.save, "BICYCLE", 1) then
+            say(t._BikeShopBagFullText, done)
+            return
+          end
+          Bag.remove(game.save, "BIKE_VOUCHER", 1)
+          Flags.set(game.save, "EVENT_GOT_BICYCLE")
+          -- BikeShopExchangedVoucherText carries sound_get_key_item; the
+          -- map runs EnableAutoTextBoxDrawing, so the box still waits for
+          -- a button once the jingle has played (auto.wait, #247)
+          say(t._BikeShopExchangedVoucherText, done, {
+            auto = { wait = true, sound = function()
+              return require("src.core.Sound").play(game.data, "Get_Key_Item")
+            end },
+          })
+        end)
+        return
+      end
+
+      -- .dontHaveVoucher: welcome, then the BICYCLE/CANCEL window
+      say(t._BikeShopClerkWelcomeText, function()
+        local pitch = t._BikeShopClerkDoYouLikeItText
+        game.stack:push(BikeShopWindow.new(game, pitch, function(bought)
+          local function comeAgain()
+            say(t._BikeShopComeAgainText, function()
+              game.stack:pop() -- the window, still up under the text
+              done()
+            end)
+          end
+          if bought then
+            -- a million is out of anyone's reach: BikeShopCantAffordText
+            say(t._BikeShopCantAffordText, comeAgain)
+          else
+            comeAgain()
+          end
+        end))
+        -- PrintText BikeShopClerkDoYouLikeItText, then straight into
+        -- HandleMenuInput: the box types out and hands over without
+        -- waiting, leaving the window's copy of the line on screen
+        say(pitch, nil, { auto = { delay = 0 } })
+      end)
     end,
   },
 }

data/scripts/story3.lua

@@ -111,8 +111,9 @@ M.POKEMON_TOWER_5F = {
 --
 -- PokemonTower6FDefaultScript starts the RESTLESS SOUL battle with NO
 -- Silph Scope check at the trigger -- the scope only decides whether the
--- battle is disguised (IsGhostBattle -> makeGhost: "too scared to move",
--- balls dodged). An earlier version of this port turned the player back
+-- disguise sticks (IsGhostBattle -> makeGhost: "too scared to move", balls
+-- dodged) or comes off in the unveil (makeUnveiledGhost, #492). An earlier
+-- version of this port turned the player back
 -- without the scope and never opened the battle, which made 6F
 -- impassable on any route that skips Rocket Hideout; vanilla lets the
 -- battle open and a POKE_DOLL end it (see wBattleResult below).
@@ -133,7 +134,13 @@ M.POKEMON_TOWER_6F = {
       -- or not the scope revealed it, so the "can't be caught" state rides
       -- the battle instead of IsGhostBattle alone (#444)
       battle.noCatch = true
-      if not game.save.inventory.SILPH_SCOPE then
+      -- InitWildBattle enters disguised for the RESTLESS SOUL either way
+      -- (core.asm:6698-6700).  The scope does not skip the disguise, it
+      -- buys the unveil PrintBeginningBattleText .isMarowak plays over it
+      -- before the battle proceeds as an ordinary wild one (#492).
+      if game.save.inventory.SILPH_SCOPE then
+        battle:makeUnveiledGhost()
+      else
         battle:makeGhost()
       end
       battle.onFinish = function(result)
@@ -353,6 +360,38 @@ M.ROCKET_HIDEOUT_B4F = {
         end))
     end,
 
+    -- Yellow swaps Rocket1/Rocket2 for Jessie & James and keeps a single
+    -- grunt, spelled ROCKETHIDEOUTB4F_ROCKET / TEXT_ROCKETHIDEOUTB4F_ROCKET
+    -- (pokeyellow/scripts/RocketHideoutB4F.asm), so the Red/Blue key above
+    -- never matched there and the LIFT KEY never dropped (#552, a
+    -- regression of #105).  Yellow also moves the drop off the second
+    -- talk: RocketHideoutB4FRocketEndBattleText is text_promptbutton +
+    -- text_asm, so its SetEvent EVENT_ROCKET_DROPPED_LIFT_KEY / ShowObject
+    -- TOGGLE_ROCKET_HIDEOUT_B4F_ITEM_5 run the instant the battle ends.
+    TEXT_ROCKETHIDEOUTB4F_ROCKET = function(game, ow, npc, done)
+      if not ow:trainerDefeated(npc) then
+        ow:engageTrainer(npc, function()
+          -- engageTrainer records the win before it calls back, so this
+          -- is the end-battle text's SetEvent + ShowObject
+          if ow:trainerDefeated(npc)
+             and not game.save.flags.EVENT_ROCKET_DROPPED_LIFT_KEY then
+            game.save.flags.EVENT_ROCKET_DROPPED_LIFT_KEY = true
+            local Commands = require("src.script.Commands")
+            Commands.show_object(
+              { game = game, save = game.save, overworld = ow },
+              "ROCKET_HIDEOUT_B4F", "ROCKETHIDEOUTB4F_LIFT_KEY")
+          end
+          done()
+        end)
+        return
+      end
+      -- RocketHideoutB4FRocketAfterBattleText: later talks only reprint
+      local TextBox = require("src.render.TextBox")
+      game.stack:push(TextBox.new(game,
+        game.data.text._RocketHideoutB4FRocketAfterBattleText
+        or "Oh no! I dropped\nthe LIFT KEY!", done))
+    end,
+
     TEXT_ROCKETHIDEOUTB4F_GIOVANNI = function(game, ow, npc, done)
       -- Giovanni has no trainer-header row (def_trainers 2); his text_asm
       -- owns both the engage and the BeatGiovanniScript aftermath.
@@ -502,45 +541,56 @@ M.GAME_CORNER = {
           end))
       end)
     end,
+    -- GameCornerClerk1Text (scripts/GameCorner.asm): the offer, a
+    -- YesNoChoice, then ¥1000 for 50 coins.  Yellow drops the "1" from the
+    -- object const and from every one of his text labels
+    -- (GameCornerClerkText, pokeyellow/scripts/GameCorner.asm) with an
+    -- identical body, so each line resolves under both spellings and the
+    -- handler is bound to both text ids just below (#552).
     TEXT_GAMECORNER_CLERK1 = function(game, ow, npc, done)
       local TextBox = require("src.render.TextBox")
       local ChoiceBox = require("src.ui.ChoiceBox")
       local t = game.data.text
+      local function line(suffix, fallback)
+        return t["_GameCornerClerk1" .. suffix]
+               or t["_GameCornerClerk" .. suffix]
+               or fallback
+      end
       game.stack:push(TextBox.new(game,
-        (t._GameCornerClerk1DoYouNeedSomeGameCoinsText
-         or "Do you need some\ngame coins?\f¥1000 for 50."), function()
+        line("DoYouNeedSomeGameCoinsText",
+             "Do you need some\ngame coins?\f¥1000 for 50."), function()
         game.stack:push(ChoiceBox.new(game, function(yes)
           if not yes then
             game.stack:push(TextBox.new(game,
-              t._GameCornerClerk1PleaseComePlaySometimeText
-              or "No? Please come\nplay sometime!", done))
+              line("PleaseComePlaySometimeText",
+                   "No? Please come\nplay sometime!"), done))
             return
           end
           -- scripts/GameCorner.asm GameCornerClerk1Text: coins need
           -- the COIN CASE and room for at least 9 coins (Has9990Coins)
           if not game.save.inventory.COIN_CASE then
             game.stack:push(TextBox.new(game,
-              t._GameCornerClerk1DontHaveCoinCaseText
-              or "You don't have a\nCOIN CASE!", done))
+              line("DontHaveCoinCaseText",
+                   "You don't have a\nCOIN CASE!"), done))
             return
           end
           if (game.save.coins or 0) >= 9990 then
             game.stack:push(TextBox.new(game,
-              t._GameCornerClerk1CoinCaseIsFullText
-              or "Oops! Your COIN\nCASE is full.", done))
+              line("CoinCaseIsFullText",
+                   "Oops! Your COIN\nCASE is full."), done))
             return
           end
           if game.save.money < 1000 then
             game.stack:push(TextBox.new(game,
-              t._GameCornerClerk1CantAffordTheCoinsText
-              or "You can't afford\nthe coins!", done))
+              line("CantAffordTheCoinsText",
+                   "You can't afford\nthe coins!"), done))
             return
           end
           game.save.money = game.save.money - 1000
           game.save.coins = math.min(9999, (game.save.coins or 0) + 50)
           game.stack:push(TextBox.new(game,
-            (t._GameCornerClerk1ThanksHereAre50CoinsText
-             or "Thanks! Here are\nyour 50 coins!")
+            line("ThanksHereAre50CoinsText",
+                 "Thanks! Here are\nyour 50 coins!")
             .. ("\fCOINS: %d"):format(game.save.coins), done))
         end))
       end))
@@ -548,6 +598,13 @@ M.GAME_CORNER = {
   },
 }
 
+-- Yellow's coin clerk is GAMECORNER_CLERK / TEXT_GAMECORNER_CLERK where Red
+-- and Blue spell him CLERK1, and the two text_asm bodies are identical, so
+-- one handler answers both ids.  Without the alias the Yellow clerk fell
+-- through to his extracted offer line with no yes/no box behind it (#552).
+M.GAME_CORNER.talk.TEXT_GAMECORNER_CLERK =
+  M.GAME_CORNER.talk.TEXT_GAMECORNER_CLERK1
+
 -- Game Corner prize lists (data/events/prizes.asm, prize_mon_levels.asm).
 -- The six mon prizes differ between Red and Blue; the three TM prizes are
 -- identical, so they are shared and appended to each version's mon list.

data/scripts/story4.lua

@@ -171,6 +171,28 @@ local function dojoBall(species, ownBall, otherBall, askKey)
   end
 end
 
+-- FightingDojoDefaultScript does not use the Master's facing direction for
+-- this battle.  It checks exactly the cell left of him, turns both sprites
+-- toward one another, and then displays his trainer text.  Keeping this out
+-- of trainer sight also lets him keep his original downward-facing pose.
+local function dojoMasterGate(game, ow, x, y)
+  if x ~= 4 or y ~= 3 or game.save.flags.EVENT_BEAT_KARATE_MASTER then
+    return false
+  end
+  local master
+  for _, npc in ipairs(ow.npcs) do
+    if npc.def and npc.def.name == "FIGHTINGDOJO_KARATE_MASTER" then
+      master = npc
+      break
+    end
+  end
+  if not master or ow:trainerDefeated(master) then return false end
+  ow.player.facing = "right"
+  master:facePlayer(ow.player)
+  ow:engageTrainer(master)
+  return true
+end
+
 M.FIGHTING_DOJO = {
   talk = {
     TEXT_FIGHTINGDOJO_HITMONLEE_POKE_BALL =
@@ -197,6 +219,7 @@ M.FIGHTING_DOJO = {
     end
     return false
   end,
+  onStep = dojoMasterGate,
 }
 
 -- -------------------------------------------------------------------

data/scripts/story5.lua

@@ -790,8 +790,19 @@ local function bikeGateGuard(coords, stopText, explainText)
     local t = text(game)
     push(game, t[stopText] or "Hey! Wait up!", function()
       push(game, t[explainText] or "You need a\nBICYCLE for\nCYCLING ROAD!", function()
+        -- pokered's Route16Gate1FGuardScript / Route18Gate1FGuardScript
+        -- (scripts/Route16Gate1F.asm, Route18Gate1F.asm) simulate one
+        -- PAD_RIGHT step after the refusal text, and only clear
+        -- wJoyIgnore / hand control back once that step finishes
+        -- (PlayerMovingRightScript). Without it the player was left
+        -- parked beside the guard's counter with no way past. #518
+        local function shoveRight()
+          ow:scriptMove(ow.player, "right", 1)
+        end
         if dist > 0 then
-          ow:scriptMove(ow.player, "up", dist)
+          ow:scriptMove(ow.player, "up", dist, shoveRight)
+        else
+          shoveRight()
         end
       end)
     end)

docs/anbernic-rg34xxsp.md

@@ -65,6 +65,13 @@ display option — COLORS, TILT, ZOOM, VOID FILL, MAX FPS — works normally. If
 your device turns out to handle the pass, launch with `POKEPORT_GBCFX=1` to
 put the row back.
 
+**PERFORMANCE defaults to LOW here.** The OPTIONS → PERFORMANCE tier defaults
+to AUTO, which reads this device as an ARM Linux handheld and resolves to
+**LOW**: the 3D tilt and survey zoom stay off and the frame rate is capped,
+so the overworld runs smoothly on the H700 out of the box. Bump it to
+BALANCED or HIGH from OPTIONS if you want the extras and your device keeps
+up; see [Performance tier](new-features.md#performance-tier-low-end-devices).
+
 The pack bundles the LÖVE 11.5 aarch64 runtime from
 [PortMaster](https://portmaster.games/), so the device does not need a
 separate `love_11.5` runtime download on first launch. The launcher resolves

docs/gameboy-hardware-limitations.md

@@ -12,7 +12,7 @@ this port.
 
 | # | Mechanic | Value | Why the Game Boy had this limit | Where it lives here |
 |---|---|---|---|---|
-| 1 | Bag capacity | 20 item slots | `wNumBagItems` save block was a fixed 20-entry id/quantity array in SRAM | `src/inventory/Bag.lua:8` (`Bag.CAPACITY = 20`) |
+| 1 | Bag capacity | 20 item slots by default | `wNumBagItems` save block was a fixed 20-entry id/quantity array in SRAM | `Data.constants.bagSize`, read by `src/inventory/Bag.lua` (`Bag.capacity`) |
 | 2 | Party size | 6 Pokémon | `wPartyMon1..6` were 6 fixed save-RAM slots | `src/pokemon/Party.lua:5` (`Party.MAX = 6`) |
 | 3 | PC storage | 12 boxes × 20 Pokémon | `wBoxDataStart` / Bill's PC allocated a fixed 12×20 SRAM block | `src/pokemon/Boxes.lua:7-8` |
 | 4 | Moves per Pokémon | 4 | Fixed 4-move-slot field in the party/box Pokémon struct | `src/pokemon/Pokemon.lua:20`, enforced again in `src/battle/BattleState.lua:1941` |
@@ -38,6 +38,10 @@ this port.
 
 ## Notes
 
+- Mods may patch `constants.bagSize` through the public content registry. The
+  native `save.lua` format keeps every existing item when the configured
+  limit changes; exporting to a cartridge `.sav` still writes only the first
+  20 bag slots because the original SRAM layout has no room for more.
 - PC Box **overflow handling** was deliberately changed even though the
   20×12 box *shape* was kept faithful: instead of Gen 1's "full box discards
   or blocks the deposit," this port spills into the next box with room.

docs/ios-install.md

@@ -1,5 +1,8 @@
 # Build & install on your iPhone — step by step
 
+Don't want to install Xcode? Download the release IPA and sideload it with
+AltStore instead — see [ios-sideload.md](ios-sideload.md).
+
 This guide assumes **zero** programming experience. Follow it top to
 bottom and you'll have the game running on your own iPhone in roughly an
 hour (most of it is waiting for downloads).
@@ -93,9 +96,6 @@ ZIP**, then double-click the zip to unpack it.
 
 ## Optional goodies
 
-- **Pokéwalker mode** (real steps → EXP): in-game **mod manager →
-  POKEWALKER → SYNC STEPS on**, allow step access when iOS asks, and go
-  for a walk.
 - **Mods**: launcher → **MODS** tab → **Import mod .zip**.
 - **Save import/export**: buttons on each game's tab, using the normal
   iOS file picker.

docs/ios-sideload.md

@@ -0,0 +1,48 @@
+# Sideload the iOS build with AltStore
+
+Every GitHub Release ships an IPA (`gen1recomp-*-ios.ipa`). Install it on
+your iPhone or iPad with [AltStore Classic](https://altstore.io/) — AltStore
+re-signs the app with **your** free Apple ID so you do not need a Mac or
+Xcode.
+
+## 1. Install AltStore
+
+Follow the official guide for your computer:
+
+- [How to Install (Windows)](https://faq.altstore.io/altstore-classic/how-to-install-altstore-windows)
+- [How to Install (macOS)](https://faq.altstore.io/altstore-classic/how-to-install-altstore-macos)
+
+You will install **AltServer** on the computer, then use it to put AltStore
+on the phone. What AltServer is and why it needs to stay running:
+
+- [AltServer](https://faq.altstore.io/altstore-classic/altserver)
+
+Stuck? Start here:
+
+- [Troubleshooting Guide](https://faq.altstore.io/altstore-classic/troubleshooting-guide)
+
+## 2. Install the game
+
+1. Download `gen1recomp-*-ios.ipa` from
+   [Releases](https://github.com/bryanthaboi/gen1recomp/releases).
+2. Open **AltStore** on the phone (AltServer must be running on the same
+   Wi‑Fi, or keep the phone plugged into the computer).
+3. Tap **My Apps → +** (or share the IPA into AltStore) and pick the file.
+4. Sign in with your Apple ID when prompted. Wait for the install to finish.
+5. On first launch: Settings → **Privacy & Security → Developer Mode** (iOS
+   16+), and Settings → **General → VPN & Device Management** → Trust your
+   Apple ID if asked.
+
+Then open the app, import your own legal `.gb` ROM on the Red/Blue tab, and
+play.
+
+## Refresh / 7-day limit
+
+With a free Apple ID, sideloaded apps stop launching after **7 days**. Keep
+AltServer running so AltStore can refresh them, or open AltStore and refresh
+manually before they expire. Saves on the phone are kept across refreshes.
+
+## Prefer building it yourself?
+
+Building from source on a Mac (no AltStore) is covered in
+[ios-install.md](ios-install.md).

docs/modding.md

@@ -167,5 +167,38 @@ The console understands these verbs (anything else is evaluated as Lua):
 - `trace PAT | trace off` — trace events/hooks matching a glob pattern.
 - `help` — list the verbs.
 
+## Tool input and title-menu hooks
+
+Tool mods that need to act once per game logic tick can wrap `input.step`.
+It runs immediately before queued button edges are promoted, so input added by
+the wrapper is visible during that same fixed step. The callback receives
+`(next, game, dt)` and must call `next(game, dt)`.
+
+`ui.title_menu.items` receives `(next, game, items)` and follows the same
+decorate-after-`next` convention as `ui.start_menu.items`. It is the safe place
+for a tool to offer a fresh-session action before gameplay begins.
+
+Ephemeral tools can wrap `save.write(next, game)` and return `false` to veto a
+progress write before world state is captured or any bytes reach disk.
+
+`render.hud` receives `(next, game, viewport)` after the finished game frame is
+composited and before touch controls draw. The window-space viewport contains
+`width`, `height`, `gameX`, `gameY`, `gameWidth`, `gameHeight`, `scale`, `dpiX`,
+and `dpiY`, so a tool can use the letterbox margins without drawing over the
+playfield or pushing an updating game state.
+
+`render.compose` wraps the whole-window composite in `Renderer:endFrame`. It
+receives `(next, renderer, ctx)`; returning `true` without calling `next` hands
+the mod full control of the window, while calling `next` runs the engine's
+normal single-window composite so the mod can decorate around it. `ctx` carries
+the finished `worldCanvas` and `uiCanvas` with their SGB `zones` / `worldZones`,
+`worldActive`, the frame metrics (`ww`, `wh`, `pw`, `ph`, `ox`, `oy`, `vpw`,
+`vph`, `scale`, `Sx`, `Sy`, `dpiX`, `dpiY`), `renderer:blitCanvas(...)` for a
+palette-correct blit of either canvas into an arbitrary screen rect, and the
+`secondScreen` bridge (`available()` / `push(imageData, w, h)` / `setEnabled`)
+for driving a second physical display. This is what lets a mod lay the two
+passes out as two stacked Game Boy screens, or push one onto a second screen,
+without the engine knowing the layout.
+
 Developer mode also arms the mod loader's dev tripwire, which flags mods
 that reach outside their permission set.

docs/new-features.md

@@ -86,14 +86,20 @@ Game Boy equivalent:
 ## Colors mode
 
 The `2` key (and the Options menu COLORS row) cycles the display mode
-through **OG RED → SGB → ADVANCED → OG → OG INV → SGB INV → CLASSIC → OG RED**.
+through **OG RED → SGB → ADVANCED → OG → OG INV → SGB INV → CLASSIC → OG RED**
+(on Blue the first slot labels **OG BLUE**; on Yellow, **OG YELLOW**).
 The first three are the real colorizations; the rest are DMG-shade novelties:
 
-- **OG RED**: the Game Boy Color boot-ROM look for Pokemon Red -- one global
-  red BG palette + one green OBJ palette, every map, no per-map variation
-  (Pokemon Red has no CGB code, so on a GBC the boot ROM colors it globally).
-  The player/NPCs stay green over the red terrain via the OBP bake +
-  post-zone redraw (`PaletteFX.GBC_BG` / `GBC_OBJ`).
+- **OG RED** / **OG BLUE**: the Game Boy Color boot-ROM look for that cart --
+  one global BG palette + one OBJ palette, every map, no per-map variation
+  (Red/Blue ship no CGB code, so on a GBC the boot ROM colors them globally).
+  The player/NPCs keep the boot-ROM OBJ color over the terrain via the OBP
+  bake + post-zone redraw (`PaletteFX.GBC_BG` / `GBC_OBJ`, or Blue's blue/pink
+  pair).
+- **OG YELLOW** (Yellow playthrough, same `ogred` save id): Pokemon Yellow's
+  authentic GBC look from `CGBBasePalettes` (`data/palettes_yellow.lua`,
+  sourced from pret/pokeyellow). Per-map / per-species colors, not a single
+  boot-ROM ramp -- Yellow was CGB-enhanced.
 - **SGB** (default): the per-map Super Game Boy region palettes
   (`data/sgb/sgb_palettes.asm`). Sprites tint with the region palette, as on
   real SGB. (This is the mode formerly mislabeled "GBC".)
@@ -137,6 +143,41 @@ effect, `=1` forces it available. The Anbernic handheld pack exports `0` from
 its launcher because the device reports `"Linux"` while its GPU is in the
 phone class (see [Anbernic RG34XXSP](anbernic-rg34xxsp.md)).
 
+## Performance tier (low-end devices)
+
+The Options **PERFORMANCE** row scales the port's optional presentation
+extras down for weaker hardware. The extras it governs are the three
+heaviest things the port adds on top of the original -- the whole-screen 3D
+**TILT** (transforms the entire map as a ground plane), the **GBC FX**
+post-process shader (a fullscreen pass), and survey **ZOOM** (zooming out
+renders the connected neighbor maps, a lot of extra overdraw) -- plus a hard
+FPS ceiling. None of this touches game logic, which is fixed-step off `dt`
+(`src/core/FixedStep.lua`), so every tier plays identically; they differ
+only in how much eye-candy the renderer is allowed to do.
+
+| Tier         | TILT | GBC FX | Survey ZOOM | Extra FPS ceiling |
+| ------------ | ---- | ------ | ----------- | ----------------- |
+| **HIGH**     | on   | on     | on          | none              |
+| **BALANCED** | off  | off    | on          | none              |
+| **LOW**      | off  | off    | off         | 60                |
+| **AUTO**     | picks a default from the device (below) |||
+
+- **AUTO** (the default) reads the device once at boot: ARM Linux handhelds
+  (e.g. the RG34XXSP) resolve to **LOW**, phones/tablets and very-low-core
+  desktops to **BALANCED**, and everything else -- a normal desktop, and
+  every existing `options.lua` that predates this option -- to **HIGH**,
+  so the common case is unchanged. See `src/core/Performance.detect`.
+- AUTO only chooses the *default*; all four tiers are selectable, so a
+  wrong guess is one row away from being overridden.
+- The clamps are applied **live** against your stored options and never
+  rewrite them (`Game:applyOptions`), so a lower tier hides your TILT / GBC
+  FX / ZOOM without forgetting them -- raising the tier restores exactly
+  what you had. (This is why the TILT / GBC FX / ZOOM rows still show your
+  saved choice on a clamped tier: it's your preference, waiting for a tier
+  that can afford it.)
+- Persisted as `save.options.performance` (`auto` | `high` | `balanced` |
+  `low`); unit-tested in `tests/engine/performance_tiers.lua`.
+
 ## Peer-to-peer link play (lua-enet)
 
 Trades and link battles connect two copies of the game directly over
@@ -151,6 +192,13 @@ tradeoff vs. the relay). Headless tests drive the protocol over an
 in-memory loopback (`Net.loopbackPair`); under LÖVE the same test file
 also exercises real UDP pairing.
 
+Red, Blue, and Yellow copies link with each other, as the real cable
+does. The compatibility fingerprint hashes only data a link mode can
+actually read, so Yellow's Dragonair/Dragonite catch-rate retunes (the
+only R/B/Y link-surface difference) no longer read as different games
+(issue #511). Moving the fingerprint is a link parity change: builds
+from before this fix will refuse to pair with builds after it.
+
 ## Fair play in link and online matches
 
 A link session is decided by the battle and nothing else, so for its
@@ -265,6 +313,14 @@ the last controller restores it immediately. Layout re-derives from the
 window size on rotation. Desktop testing: `POKEPORT_TOUCH=1 love .` forces
 the overlay on and lets the mouse act as a finger (`=0` forces it off).
 
+The launcher's **Touch Controls** button opens a drag editor: move each
+button freely, **Disable** to hide the overlay permanently (for
+controllers / emulation handhelds -- distinct from the temporary
+gamepad auto-hide), **Reset** for defaults, **Done** to save into
+`options.lua` as normalized window fractions so rotation keeps the
+relative placement. In-game, Options → **TOUCH PAD** toggles the same
+on/off flag without leaving a play session.
+
 ## Translation support
 
 Every string the player can read is now reachable from a mod, so a
@@ -324,7 +380,8 @@ semantics - so the two windows read as one app. Six tabs:
   party dock, so deposit and withdraw live in one place. Empty slots are
   clickable and create a mon there.
 - **Items**: money, a searchable item picker (replacing the arrows that
-  cycled one id at a time through ~250 items), the 20-slot bag, PC storage
+  cycled one id at a time through ~250 items), the configurable bag (20 slots
+  by default), PC storage
   with no slot cap, and the eight badges as toggle chips.
 - **Events**: flags, defeated trainers, taken items and per-map object
   toggles, with a real filter field and a two-column paged grid.
@@ -367,3 +424,27 @@ kind, number, height/weight, dex text) to a PNG at 4x scale under
 `prints/` in the save directory, then reports the filename in a dialog.
 No printer hardware or link cable emulation involved; the file is the
 printout.
+
+## Find Mods (community mod indexes)
+
+A FIND MODS tab sits beside MODS in the launcher and browses a published
+mod index: a metadata-only feed listing mods that live in their authors'
+own repositories. No index ships with the launcher and none is ever added
+automatically, so the tab opens on an "Add an index" prompt until you name
+one; paste an index URL or its `owner/repo` and it is remembered in
+`options.lua`. More than one index can be added, and the listings merge.
+
+## Soft reset (all versions)
+
+Holding A, B, START and SELECT together restarts the game the way flicking
+a Game Boy's power switch did, dropping straight back to the title screen.
+It works from anywhere, including mid-battle, which the QUIT entry on the
+start menu cannot do: the original combo is how stationary and gift
+Pokemon get their stats rerolled without sitting through a full relaunch.
+Unsaved progress is discarded, exactly as on hardware.
+
+As on the original, the four buttons have to stay held for 16 straight
+polls (better than a quarter of a second) and any direction in the mix
+cancels it, so it is hard to hit by accident -- including on the on-screen
+touch controls, where it would take four fingers held on four separate
+controls.

main.lua

@@ -10,7 +10,7 @@
 
 local editorMode = os.getenv("POKEPORT_EDITOR") == "1" or POKEPORT_EDITOR_MODE == true
 
-local Game, EditorApp, Importer
+local Game, EditorApp, Importer, TouchEditor
 
 local autopilot -- optional scripted-input dev tool (tests/autopilot.lua)
 local driverCo  -- optional frame-driver (POKEPORT_DRIVER=file.lua): a
@@ -134,6 +134,26 @@ function closeEditor()
   end
 end
 
+-- ------------------------------------------------------------ touch controls editor
+-- Suspends the launcher while the player drags on-screen buttons / toggles
+-- the overlay off (#327).  No ROM cache needed -- options.lua only.
+local touchEditorHost
+local closeTouchControlsEditor  -- forward declaration
+
+local function openTouchControlsEditor()
+  touchEditorHost = Importer
+  Importer = nil
+  TouchEditor = require("src.ui.TouchControlsEditor")
+  TouchEditor.load({ onClose = function() closeTouchControlsEditor() end })
+end
+
+function closeTouchControlsEditor()
+  if TouchEditor and TouchEditor.unload then TouchEditor.unload() end
+  TouchEditor = nil
+  Importer = touchEditorHost
+  touchEditorHost = nil
+end
+
 local function bootGame(version)
   -- The launcher hands us the chosen game (Red / Blue / Yellow); scripted and
   -- headless runs fall back to POKEPORT_VERSION, then Red.  Set the active
@@ -239,11 +259,17 @@ function love.load(args)
   Importer = RomImporter.new(function(version)
     Importer = nil
     bootGame(version)
-  end, { launcher = true, forceImport = forceImport, onEditSave = openEditor })
+  end, {
+    launcher = true,
+    forceImport = forceImport,
+    onEditSave = openEditor,
+    onEditTouchControls = openTouchControlsEditor,
+  })
 end
 
 function love.update(dt)
   if editorMode then return EditorApp.update(dt) end
+  if TouchEditor then return TouchEditor.update(dt) end
   if Importer then return Importer:update(dt) end
 
   -- Scripted runs (autopilot / POKEPORT_DRIVER) observe and act exactly
@@ -283,6 +309,7 @@ end
 
 function love.draw()
   if editorMode then return EditorApp.draw() end
+  if TouchEditor then return TouchEditor.draw() end
   if Importer then return Importer:draw() end
 
   Game:draw()
@@ -303,60 +330,61 @@ end
 
 function love.keypressed(key, scancode, isrepeat)
   if editorMode then return EditorApp.keypressed(key) end
+  if TouchEditor then return TouchEditor.keypressed(key) end
   if Importer then return Importer:keypressed(key) end
   Game:keypressed(key)
 end
 
 function love.keyreleased(key)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return end
   Game:keyreleased(key)
 end
 
 function love.gamepadpressed(joystick, button)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return Importer:gamepadpressed(joystick, button) end
   Game:gamepadpressed(joystick, button)
 end
 
 function love.gamepadreleased(joystick, button)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return Importer:gamepadreleased(joystick, button) end
   Game:gamepadreleased(joystick, button)
 end
 
 function love.gamepadaxis(joystick, axis, value)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return Importer:gamepadaxis(joystick, axis, value) end
   Game:gamepadaxis(joystick, axis, value)
 end
 
 function love.joystickpressed(joystick, button)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return Importer:joystickpressed(joystick, button) end
   Game:joystickpressed(joystick, button)
 end
 
 function love.joystickreleased(joystick, button)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return Importer:joystickreleased(joystick, button) end
   Game:joystickreleased(joystick, button)
 end
 
 function love.joystickaxis(joystick, axis, value)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return Importer:joystickaxis(joystick, axis, value) end
   Game:joystickaxis(joystick, axis, value)
 end
 
 function love.joystickhat(joystick, hat, direction)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return Importer:joystickhat(joystick, hat, direction) end
   Game:joystickhat(joystick, hat, direction)
 end
 
 function love.joystickremoved(joystick)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return end
   Game:joystickremoved(joystick)
 end
@@ -365,7 +393,7 @@ end
 -- direction's key-up can be delivered to the OS instead of the game while
 -- unfocused, so reset input on either transition rather than trust it.
 function love.focus(f)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then
     if Importer.focus then Importer:focus(f) end
     return
@@ -375,13 +403,19 @@ end
 
 -- v is true when the window becomes visible again, false on minimize.
 function love.visible(v)
-  if editorMode then return end
+  if editorMode or TouchEditor then return end
   if Importer then return end
   Game:visible(v)
 end
 
 function love.touchpressed(id, x, y, dx, dy, pressure)
   if editorMode then return end
+  if TouchEditor then
+    -- iOS synthesizes mousepressed for the primary touch (same as the
+    -- launcher); Android drives the editor through love.touch directly.
+    if love.system.getOS() == "iOS" then return end
+    return TouchEditor.touchpressed(id, x, y)
+  end
   if Importer then
     -- iOS: LÖVE already synthesizes a mousepressed for the primary touch,
     -- and love.mousepressed below forwards that to the Importer, so
@@ -399,12 +433,20 @@ end
 
 function love.touchmoved(id, x, y, dx, dy, pressure)
   if editorMode then return end
+  if TouchEditor then
+    if love.system.getOS() == "iOS" then return end
+    return TouchEditor.touchmoved(id, x, y)
+  end
   if Importer then return end
   Game:touchmoved(id, x, y)
 end
 
 function love.touchreleased(id, x, y, dx, dy, pressure)
   if editorMode then return end
+  if TouchEditor then
+    if love.system.getOS() == "iOS" then return end
+    return TouchEditor.touchreleased(id, x, y)
+  end
   if Importer then return end
   Game:touchreleased(id, x, y)
 end
@@ -414,12 +456,36 @@ function love.wheelmoved(x, y)
     if EditorApp.wheelmoved then return EditorApp.wheelmoved(x, y) end
     return
   end
+  if TouchEditor then return end
   if Importer then return end
   Game:wheelmoved(x, y)
 end
 
-function love.mousepressed(x, y, button)
-  if Importer then return Importer:mousepressed(x, y, button) end
+function love.mousepressed(x, y, button, istouch)
+  if TouchEditor then
+    -- Android primary touch already arrived via love.touchpressed; a second
+    -- mouse path would double-fire Done / begin a second drag.
+    if love.system.getOS() == "Android" then return end
+    return TouchEditor.mousepressed(x, y, button)
+  end
+  if Importer then
+    -- The same double-fire TouchEditor guards against, which the launcher was
+    -- missing: love.touchpressed above forwards the primary touch to the
+    -- Importer on Android, and LÖVE ALSO synthesizes a mouse press for that
+    -- same touch, so one tap ran every launcher button twice.  On Import that
+    -- meant two choose() calls and two stacked SAF picker activities: the
+    -- player picked their ROM, the top picker closed, and the second was still
+    -- underneath asking for it again, which is the "import the file twice"
+    -- in #553.  Filtering on istouch keeps a real mouse (DeX, a Chromebook, a
+    -- USB mouse) working, which an Android-wide return would have broken.
+    --
+    -- ANDROID ONLY, and the OS test is load bearing: love.touchpressed above
+    -- returns early on iOS and never forwards, so there the synthesized mouse
+    -- press is the ONLY event the launcher gets.  Filtering istouch on both
+    -- killed every tap on iOS outright.
+    if istouch and love.system.getOS() == "Android" then return end
+    return Importer:mousepressed(x, y, button)
+  end
   if editorMode and EditorApp.mousepressed then
     return EditorApp.mousepressed(x, y, button)
   end
@@ -429,6 +495,10 @@ function love.mousepressed(x, y, button)
 end
 
 function love.mousereleased(x, y, button)
+  if TouchEditor then
+    if love.system.getOS() == "Android" then return end
+    return TouchEditor.mousereleased(x, y, button)
+  end
   if Importer then return end
   if editorMode and EditorApp.mousereleased then
     return EditorApp.mousereleased(x, y, button)
@@ -439,6 +509,10 @@ function love.mousereleased(x, y, button)
 end
 
 function love.mousemoved(x, y)
+  if TouchEditor then
+    if love.system.getOS() == "Android" then return end
+    return TouchEditor.mousemoved(x, y)
+  end
   if editorMode or Importer then return end
   if mouseTouch and Game and love.mouse.isDown(1) then
     Game:touchmoved("mouse", x, y)
@@ -446,6 +520,7 @@ function love.mousemoved(x, y)
 end
 
 function love.textinput(text)
+  if TouchEditor then return end
   if Importer then return Importer:textinput(text) end
   if editorMode and EditorApp.textinput then
     return EditorApp.textinput(text)

mobile/ANDROID.md

@@ -50,6 +50,29 @@ chosen file under the app save directory as `picked_rom.gb`,
 from that folder on Choose / refocus; see `docs/launcher.md`. The APK payload
 itself remains data-free (no embedded ROM or generated cache).
 
+### Step bridge (Pokéwalker mod)
+
+`love.system.syncHealthSteps()` → `GameActivity.syncHealthSteps` (same
+JNI route as the picker: `common/android.cpp` →
+`modules/system/System.cpp` → `wrap_System.cpp`). The Java side does a
+one-shot read of the hardware `TYPE_STEP_COUNTER` sensor (cumulative
+since boot, counted by the OS whether or not any app runs), anchors the
+reading in `SharedPreferences` so a walk is never credited twice
+(a reading below the anchor means the phone rebooted → re-anchor without
+crediting), and stages the delta as `steps_pending.json` in the save
+identity dir — the same contract as the iOS `GRHealthBridge`. Nothing in
+the base game calls it; the consumer is the
+[Pokéwalker mod](https://github.com/mresnick67/Gen1ReComp-Pokewalker),
+installed as a mod `.zip` at runtime (its SYNC STEPS option defaults
+off).
+
+Android 10+ gates the sensor behind the `ACTIVITY_RECOGNITION` runtime
+permission (declared in `app/src/main/AndroidManifest.xml`; keep it out
+of the build script's permission trim). The first
+`syncHealthSteps()` call shows the system prompt; on grant the sensor
+read runs immediately (`onRequestPermissionsResult`,
+`STEP_PERMISSION_REQUEST_CODE`).
+
 ### SDK / NDK
 
 love-android 11.5a expects:
@@ -82,7 +105,7 @@ scripts, tests, and mobile build sources are excluded.
 | --- | --- |
 | `app.application_id` | `com.theboisclub.pokemonred` |
 | `app.name` | Pokemon Red |
-| `app.orientation` | `portrait` |
+| `app.orientation` | `fullUser`. This is only the manifest default: SDL requests FULL_SENSOR at window creation (resizable window, no `SDL_HINT_ORIENTATIONS`), and `GameActivity.setOrientationBis` remaps that to FULL_USER so the device's rotation lock is honoured. |
 | `app.version_name` / `app.version_code` | set from `--version X.Y.Z` (code = major*10000 + minor*100 + patch); left as-is if `--version` is omitted |
 | Permissions | INTERNET / RECORD_AUDIO / WRITE_EXTERNAL_STORAGE stripped; VIBRATE + BLUETOOTH kept |
 

mobile/android/app/src/main/AndroidManifest.xml

@@ -8,6 +8,11 @@
        the link screen shows as "(Operation not permitted)" (issue #287).
        scripts/build_android.sh must not strip this again. -->
   <uses-permission android:name="android.permission.INTERNET" />
+  <!-- Step bridge: love.system.syncHealthSteps reads the hardware step
+       counter, which Android 10+ gates behind this runtime permission.
+       Requested only on the first sync call (the Pokéwalker mod's SYNC
+       STEPS option); scripts/build_android.sh must not strip it. -->
+  <uses-permission android:name="android.permission.ACTIVITY_RECOGNITION" />
 <!-- OpenGL ES 2.0 -->
   <uses-feature android:glEsVersion="0x00020000" />
   <!-- Touchscreen support -->

mobile/android/love/src/jni/love/src/common/android.cpp

@@ -219,6 +219,18 @@ bool showCreateDocument(const char *suggestedName)
 	return result;
 }
 
+bool syncHealthSteps()
+{
+	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
+	jclass activity = env->FindClass("org/love2d/android/GameActivity");
+
+	jmethodID method = env->GetStaticMethodID(activity, "syncHealthSteps", "()Z");
+	jboolean result = env->CallStaticBooleanMethod(activity, method);
+
+	env->DeleteLocalRef(activity);
+	return result;
+}
+
 /*
  * Helper functions for the filesystem module
  */
@@ -851,4 +863,51 @@ const char *getArg0()
 } // android
 } // love
 
+extern "C" __attribute__((visibility("default")))
+int love_android_secondary_ready()
+{
+	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
+	jclass activity = env->FindClass("org/love2d/android/GameActivity");
+	jmethodID m = env->GetStaticMethodID(activity, "hasSecondaryDisplay", "()Z");
+	jboolean ready = JNI_FALSE;
+	if (m)
+		ready = env->CallStaticBooleanMethod(activity, m);
+	else
+		env->ExceptionClear();
+	env->DeleteLocalRef(activity);
+	return ready ? 1 : 0;
+}
+
+extern "C" __attribute__((visibility("default")))
+void love_android_push_secondary(const void *rgba, int w, int h)
+{
+	if (!rgba || w <= 0 || h <= 0)
+		return;
+	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
+	jclass activity = env->FindClass("org/love2d/android/GameActivity");
+	jmethodID m = env->GetStaticMethodID(activity, "updateSecondaryFrame", "(Ljava/nio/ByteBuffer;II)V");
+	if (m)
+	{
+		jobject buf = env->NewDirectByteBuffer((void*) rgba, (jlong) w * (jlong) h * 4);
+		env->CallStaticVoidMethod(activity, m, buf, w, h);
+		env->DeleteLocalRef(buf);
+	}
+	else
+		env->ExceptionClear();
+	env->DeleteLocalRef(activity);
+}
+
+extern "C" __attribute__((visibility("default")))
+void love_android_secondary_enable(int on)
+{
+	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();
+	jclass activity = env->FindClass("org/love2d/android/GameActivity");
+	jmethodID m = env->GetStaticMethodID(activity, "setSecondaryEnabled", "(Z)V");
+	if (m)
+		env->CallStaticVoidMethod(activity, m, on ? JNI_TRUE : JNI_FALSE);
+	else
+		env->ExceptionClear();
+	env->DeleteLocalRef(activity);
+}
+
 #endif // LOVE_ANDROID

mobile/android/love/src/jni/love/src/common/android.h

@@ -74,6 +74,13 @@ bool showFilePicker(const char *destFilename = nullptr);
  **/
 bool showCreateDocument(const char *suggestedName = nullptr);
 
+/**
+ * Pokéwalker step bridge: asks GameActivity to read the hardware step
+ * counter and stage steps_pending.json in the save identity dir (see
+ * GameActivity.syncHealthSteps). Returns whether a sync could start.
+ */
+bool syncHealthSteps();
+
 /*
  * Helper functions for the filesystem module
  */

mobile/android/love/src/jni/love/src/modules/system/System.cpp

@@ -212,6 +212,15 @@ bool System::createFile(const char *suggestedName) const
 #endif
 }
 
+bool System::syncHealthSteps() const
+{
+#ifdef LOVE_ANDROID
+	return love::android::syncHealthSteps();
+#else
+	return false;
+#endif
+}
+
 bool System::hasBackgroundMusic() const
 {
 #if defined(LOVE_ANDROID)

mobile/android/love/src/jni/love/src/modules/system/System.h

@@ -127,6 +127,12 @@ public:
 	 **/
 	virtual bool createFile(const char *suggestedName = nullptr) const;
 
+	/**
+	 * Pokéwalker: stage pending real-world steps (steps_pending.json in the
+	 * save dir) from the platform step source. Android-only; false elsewhere.
+	 */
+	virtual bool syncHealthSteps() const;
+
 	/**
 	 * Gets if the user is playing music on background.
 	 * Throws an exception on unsupported platforms.

mobile/android/love/src/jni/love/src/modules/system/wrap_System.cpp

@@ -109,6 +109,12 @@ int w_createFile(lua_State *L)
 	return 1;
 }
 
+int w_syncHealthSteps(lua_State *L)
+{
+	luax_pushboolean(L, instance()->syncHealthSteps());
+	return 1;
+}
+
 int w_hasBackgroundMusic(lua_State *L)
 {
 	lua_pushboolean(L, instance()->hasBackgroundMusic());
@@ -126,6 +132,7 @@ static const luaL_Reg functions[] =
 	{ "vibrate", w_vibrate },
 	{ "pickFile", w_pickFile },
 	{ "createFile", w_createFile },
+	{ "syncHealthSteps", w_syncHealthSteps },
 	{ "hasBackgroundMusic", w_hasBackgroundMusic },
 	{ 0, 0 }
 };

mobile/android/love/src/main/java/org/love2d/android/GameActivity.java

@@ -41,12 +41,20 @@ import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.pm.ActivityInfo;
 import android.content.pm.ApplicationInfo;
 import android.content.res.AssetManager;
+import android.hardware.Sensor;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+import android.hardware.SensorManager;
 import android.media.AudioManager;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Environment;
+import android.os.Handler;
+import android.os.Looper;
 import android.os.Vibrator;
 import android.util.Log;
 import android.util.DisplayMetrics;
@@ -66,6 +74,7 @@ public class GameActivity extends SDLActivity {
     public static final int RECORD_AUDIO_REQUEST_CODE = 3;
     public static final int FILE_PICKER_REQUEST_CODE = 4;
     public static final int FILE_CREATE_REQUEST_CODE = 5;
+    public static final int STEP_PERMISSION_REQUEST_CODE = 6;
     /** @deprecated Prefer FILE_PICKER_REQUEST_CODE; kept for older call sites. */
     public static final int ROM_PICKER_REQUEST_CODE = FILE_PICKER_REQUEST_CODE;
     // Mirrors conf.lua's t.identity ("pokemon-love2d"): where the picked file
@@ -82,8 +91,27 @@ public class GameActivity extends SDLActivity {
     // basename as its body, so RomImporter:focus can say so in the launcher
     // instead of leaving the player on "No ROM imported" (issue #442).
     private static final String PICK_ERROR_FILENAME = "pick_error.flag";
+    // Step bridge (love.system.syncHealthSteps): pending-steps delivery
+    // consumed by the Pokéwalker mod, same contract as the iOS
+    // GRHealthBridge. Steps come from the hardware TYPE_STEP_COUNTER
+    // (cumulative since boot, counted by the OS whether or not any app is
+    // running), anchored in SharedPreferences so a walk is never credited
+    // twice.
+    private static final String PENDING_STEPS_FILENAME = "steps_pending.json";
+    private static final String STEP_PREFS = "pokewalker_steps";
+    private static final String STEP_PREF_ANCHOR = "anchor";
+    private static final String STEP_PREF_ANCHOR_WALLTIME = "anchor_walltime";
+    private static final long STEP_MAX_PER_SYNC = 50000;
     // Destination basename for the in-flight SAF pick (set by showFilePicker).
+    // Saved/restored across instance state: the picker is a separate activity
+    // and Android may destroy this one while it is up (memory pressure, or
+    // "Don't keep activities"). A recreated instance still receives
+    // onActivityResult, so without this a mod or save pick came back with the
+    // field reset and was filed as picked_rom.gb, which Lua then rejected as a
+    // bad ROM instead of installing it (#553).
     private String pendingPickFilename = PICKED_ROM_FILENAME;
+    private static final String STATE_PENDING_PICK = "pendingPickFilename";
+    private static final String STATE_PENDING_CREATE = "pendingCreateSuggestedName";
     // Suggested download name for the in-flight SAF create (set by showCreateDocument).
     private String pendingCreateSuggestedName = "export.sav";
     private static boolean immersiveActive = false;
@@ -148,6 +176,14 @@ public class GameActivity extends SDLActivity {
         }
 
         super.onCreate(savedInstanceState);
+        if (savedInstanceState != null) {
+            // Restore the in-flight SAF destinations, so a pick that returns to
+            // a recreated activity still lands under the basename it asked for.
+            String pick = savedInstanceState.getString(STATE_PENDING_PICK);
+            if (pick != null) pendingPickFilename = pick;
+            String create = savedInstanceState.getString(STATE_PENDING_CREATE);
+            if (create != null) pendingCreateSuggestedName = create;
+        }
         metrics = getResources().getDisplayMetrics();
 
         // Set low-latency audio values
@@ -295,12 +331,62 @@ public class GameActivity extends SDLActivity {
             Log.d("GameActivity", "Cancelling vibration");
             vibrator.cancel();
         }
+        teardownSecondaryDisplay();
         super.onPause();
     }
 
     @Override
     public void onResume() {
         super.onResume();
+        setupSecondaryDisplay();
+    }
+
+    /**
+     * SDL decides the activity's requested orientation at window creation
+     * (SDLActivity.setOrientationBis). With a resizable window and no
+     * SDL_HINT_ORIENTATIONS -- exactly what conf.lua produces on Android --
+     * it asks for SCREEN_ORIENTATION_FULL_SENSOR, and that request overrides
+     * the android:screenOrientation="fullUser" set in the manifest. The
+     * *_SENSOR constants follow the accelerometer even when the player has
+     * turned auto-rotate off, so the game kept rotating on a device whose
+     * rotation was locked.
+     *
+     * Remap SDL's choice onto the matching *_USER constant, which allows the
+     * same orientations but defers to the system rotation setting. Applied
+     * after super so SDL keeps deciding *which* orientations the window may
+     * take; this only changes who breaks the tie, the sensor or the player.
+     */
+    @Override
+    public void setOrientationBis(int w, int h, boolean resizable, String hint) {
+        super.setOrientationBis(w, h, resizable, hint);
+
+        // The *_USER constants only exist from API 18; below that the sensor
+        // ones are all there is, so leave SDL's request alone.
+        if (android.os.Build.VERSION.SDK_INT < 18) {
+            return;
+        }
+
+        int requested = getRequestedOrientation();
+        int userRequested;
+        switch (requested) {
+            case ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR:
+                userRequested = ActivityInfo.SCREEN_ORIENTATION_FULL_USER;
+                break;
+            case ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE:
+                userRequested = ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE;
+                break;
+            case ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT:
+                userRequested = ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT;
+                break;
+            default:
+                // SENSOR / plain LANDSCAPE / PORTRAIT etc: either already
+                // explicit or never produced by setOrientationBis.
+                return;
+        }
+
+        Log.d("GameActivity", "requestedOrientation " + requested + " -> " + userRequested
+            + " (honour the device rotation lock)");
+        setRequestedOrientation(userRequested);
     }
 
     @Keep
@@ -467,6 +553,160 @@ public class GameActivity extends SDLActivity {
         }
     }
 
+    /**
+     * Step sync, called from Lua as love.system.syncHealthSteps()
+     * (see modules/system/wrap_System.cpp). Asynchronous like the picker:
+     * returns whether a sync could be started; the result lands later as
+     * steps_pending.json in the save identity dir, where the Pokéwalker
+     * mod's poll consumes it.
+     *
+     * Android 10+ gates the step counter behind the ACTIVITY_RECOGNITION
+     * runtime permission; the first call shows the system prompt and a later
+     * sync (the mod retries on save load / option change) delivers.
+     */
+    @Keep
+    public static boolean syncHealthSteps() {
+        final GameActivity self = (GameActivity) mSingleton;
+        if (self == null) return false;
+        if (android.os.Build.VERSION.SDK_INT >= 29
+                && ActivityCompat.checkSelfPermission(self,
+                    Manifest.permission.ACTIVITY_RECOGNITION)
+                    != PackageManager.PERMISSION_GRANTED) {
+            self.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    ActivityCompat.requestPermissions(self,
+                        new String[]{Manifest.permission.ACTIVITY_RECOGNITION},
+                        STEP_PERMISSION_REQUEST_CODE);
+                }
+            });
+            return true;
+        }
+        self.startStepSensorRead();
+        return true;
+    }
+
+    /**
+     * One-shot read of the cumulative hardware step counter. The sensor
+     * usually reports its cached value moments after registration; some
+     * devices hold the event until the next physical step, so the listener
+     * is given 20 seconds before being torn down (the next sync retries).
+     */
+    private void startStepSensorRead() {
+        final SensorManager manager =
+            (SensorManager) getSystemService(Context.SENSOR_SERVICE);
+        if (manager == null) return;
+        Sensor counter = manager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
+        if (counter == null) {
+            Log.d("GameActivity", "no step counter sensor on this device");
+            return;
+        }
+        final SensorEventListener listener = new SensorEventListener() {
+            private boolean delivered = false;
+
+            @Override
+            public void onSensorChanged(SensorEvent event) {
+                if (delivered || event.values.length == 0) return;
+                delivered = true;
+                manager.unregisterListener(this);
+                deliverSteps((long) event.values[0]);
+            }
+
+            @Override
+            public void onAccuracyChanged(Sensor sensor, int accuracy) {
+            }
+        };
+        if (!manager.registerListener(listener, counter,
+                SensorManager.SENSOR_DELAY_NORMAL)) {
+            Log.d("GameActivity", "step counter listener registration failed");
+            return;
+        }
+        new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                // No-op if the listener already delivered and unregistered.
+                manager.unregisterListener(listener);
+            }
+        }, 20000);
+    }
+
+    /**
+     * Convert a cumulative counter reading into pending steps. The counter
+     * resets to zero on reboot: a reading below the stored anchor re-anchors
+     * without crediting (steps walked between the reboot and this sync are
+     * lost, which errs on the honest side).
+     */
+    private void deliverSteps(long counterNow) {
+        SharedPreferences prefs = getSharedPreferences(STEP_PREFS, MODE_PRIVATE);
+        long anchor = prefs.getLong(STEP_PREF_ANCHOR, -1);
+        long now = System.currentTimeMillis();
+        if (anchor < 0 || counterNow < anchor) {
+            prefs.edit()
+                .putLong(STEP_PREF_ANCHOR, counterNow)
+                .putLong(STEP_PREF_ANCHOR_WALLTIME, now)
+                .apply();
+            Log.d("GameActivity", "step anchor set at " + counterNow);
+            return;
+        }
+        long steps = Math.min(counterNow - anchor, STEP_MAX_PER_SYNC);
+        long fromWalltime = prefs.getLong(STEP_PREF_ANCHOR_WALLTIME, now);
+        if (steps <= 0) return;
+        prefs.edit()
+            .putLong(STEP_PREF_ANCHOR, counterNow)
+            .putLong(STEP_PREF_ANCHOR_WALLTIME, now)
+            .apply();
+
+        File dir = saveIdentityDir();
+        if (!dir.isDirectory() && !dir.mkdirs()) {
+            Log.d("GameActivity", "cannot create save dir for steps: " + dir);
+            return;
+        }
+        File pending = new File(dir, PENDING_STEPS_FILENAME);
+        long total = steps;
+        // Merge with an unconsumed earlier delivery so steps are never lost
+        // (same contract as the iOS bridge).
+        if (pending.isFile()) {
+            try {
+                byte[] raw = new byte[(int) Math.min(pending.length(), 4096)];
+                FileInputStream in = new FileInputStream(pending);
+                int read = in.read(raw);
+                in.close();
+                if (read > 0) {
+                    org.json.JSONObject old =
+                        new org.json.JSONObject(new String(raw, 0, read, "UTF-8"));
+                    total += Math.max(0, old.optLong("steps", 0));
+                }
+            } catch (Exception e) {
+                Log.d("GameActivity", "ignoring unreadable pending steps: " + e);
+            }
+        }
+        try {
+            org.json.JSONObject payload = new org.json.JSONObject();
+            payload.put("steps", total);
+            payload.put("from", isoTime(fromWalltime));
+            payload.put("to", isoTime(now));
+            File tmp = new File(dir, PENDING_STEPS_FILENAME + ".tmp");
+            FileOutputStream out = new FileOutputStream(tmp);
+            out.write(payload.toString().getBytes("UTF-8"));
+            out.close();
+            if (!tmp.renameTo(pending)) {
+                tmp.delete();
+                Log.d("GameActivity", "could not publish pending steps");
+                return;
+            }
+            Log.d("GameActivity", total + " steps pending for the Pokewalker mod");
+        } catch (Exception e) {
+            Log.d("GameActivity", "could not write pending steps: " + e);
+        }
+    }
+
+    private static String isoTime(long millis) {
+        java.text.SimpleDateFormat format =
+            new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", java.util.Locale.US);
+        format.setTimeZone(java.util.TimeZone.getTimeZone("UTC"));
+        return format.format(new java.util.Date(millis));
+    }
+
     private boolean copyFileToUri(File source, Uri destUri) {
         InputStream in = null;
         OutputStream out = null;
@@ -490,6 +730,13 @@ public class GameActivity extends SDLActivity {
         }
     }
 
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putString(STATE_PENDING_PICK, pendingPickFilename);
+        outState.putString(STATE_PENDING_CREATE, pendingCreateSuggestedName);
+    }
+
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
@@ -690,6 +937,17 @@ public class GameActivity extends SDLActivity {
                     }
                     break;
                 }
+                case STEP_PERMISSION_REQUEST_CODE: {
+                    if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                        Log.d("GameActivity", "Step permission granted");
+                        // Deliver right away so the sync the player just
+                        // opted into doesn't wait for the next launch.
+                        startStepSensorRead();
+                    } else {
+                        Log.d("GameActivity", "Did not get step permission.");
+                    }
+                    break;
+                }
                 default:
                     super.onRequestPermissionsResult(requestCode, permissions, grantResults);
             }
@@ -872,4 +1130,182 @@ public class GameActivity extends SDLActivity {
             return applicationInfo.sourceDir + "!/lib/" + abi + "/?.so";
         }
     }
+
+    // Dual-screen: mirror the engine's bottom-screen canvas onto a secondary
+    // physical display. Driven from the engine through love_android_secondary_*
+    // in src/jni/love/src/common/android.cpp.
+    private static volatile SecondaryPresentation secondaryPresentation;
+    private static volatile boolean secondaryEnabled = false;
+
+    @Keep
+    public static void setSecondaryEnabled(final boolean on) {
+        secondaryEnabled = on;
+        final GameActivity self = (GameActivity) mSingleton;
+        if (self == null) return;
+        self.runOnUiThread(new Runnable() {
+            @Override public void run() {
+                if (on) setupSecondaryDisplay(); else teardownSecondaryDisplay();
+            }
+        });
+    }
+
+    private static void setupSecondaryDisplay() {
+        GameActivity self = (GameActivity) mSingleton;
+        if (self == null || !secondaryEnabled || secondaryPresentation != null) return;
+        try {
+            android.hardware.display.DisplayManager dm =
+                (android.hardware.display.DisplayManager) self.getSystemService(Context.DISPLAY_SERVICE);
+            if (dm == null) return;
+            Display chosen = null;
+            for (Display d : dm.getDisplays()) {
+                android.graphics.Point size = new android.graphics.Point();
+                d.getRealSize(size);
+                Log.d("GameActivity", "display id=" + d.getDisplayId() + " name=" + d.getName()
+                    + " size=" + size.x + "x" + size.y);
+                if (chosen == null && d.getDisplayId() != Display.DEFAULT_DISPLAY) {
+                    chosen = d;
+                }
+            }
+            if (chosen == null) {
+                Display[] pres =
+                    dm.getDisplays(android.hardware.display.DisplayManager.DISPLAY_CATEGORY_PRESENTATION);
+                if (pres != null && pres.length > 0) chosen = pres[0];
+            }
+            if (chosen == null) {
+                Log.d("GameActivity", "no secondary display found");
+                return;
+            }
+            SecondaryPresentation p = new SecondaryPresentation(self, chosen);
+            p.show();
+            secondaryPresentation = p;
+            Log.d("GameActivity", "secondary display presentation started on id=" + chosen.getDisplayId());
+        } catch (Throwable t) {
+            Log.d("GameActivity", "secondary display setup failed: " + t);
+            secondaryPresentation = null;
+        }
+    }
+
+    private static void teardownSecondaryDisplay() {
+        SecondaryPresentation p = secondaryPresentation;
+        secondaryPresentation = null;
+        if (p != null) {
+            try { p.dismiss(); } catch (Throwable t) {}
+        }
+    }
+
+    @Keep
+    public static boolean hasSecondaryDisplay() {
+        return secondaryPresentation != null;
+    }
+
+    @Keep
+    public static void updateSecondaryFrame(java.nio.ByteBuffer buf, int w, int h) {
+        SecondaryPresentation p = secondaryPresentation;
+        if (p != null && buf != null && w > 0 && h > 0) {
+            p.updateFrame(buf, w, h);
+        }
+    }
+
+    private static class SecondaryPresentation extends android.app.Presentation {
+        private final FrameView frameView;
+
+        SecondaryPresentation(Context context, Display display) {
+            super(context, display);
+            frameView = new FrameView(context);
+        }
+
+        @Override
+        protected void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+            android.view.Window w = getWindow();
+            if (w != null) {
+                w.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN
+                    | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
+                    WindowManager.LayoutParams.FLAG_FULLSCREEN
+                    | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
+                w.setLayout(WindowManager.LayoutParams.MATCH_PARENT,
+                    WindowManager.LayoutParams.MATCH_PARENT);
+            }
+            setContentView(frameView);
+            applyImmersive();
+            frameView.post(new Runnable() {
+                @Override public void run() { applyImmersive(); }
+            });
+        }
+
+        @Override
+        public void onWindowFocusChanged(boolean hasFocus) {
+            super.onWindowFocusChanged(hasFocus);
+            if (hasFocus) applyImmersive();
+        }
+
+        private void applyImmersive() {
+            android.view.Window w = getWindow();
+            if (w == null) return;
+            if (android.os.Build.VERSION.SDK_INT >= 30) {
+                w.setDecorFitsSystemWindows(false);
+                android.view.WindowInsetsController c = w.getInsetsController();
+                if (c != null) {
+                    c.hide(android.view.WindowInsets.Type.systemBars());
+                    c.setSystemBarsBehavior(
+                        android.view.WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE);
+                }
+            } else {
+                w.getDecorView().setSystemUiVisibility(
+                    android.view.View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                    | android.view.View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                    | android.view.View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                    | android.view.View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                    | android.view.View.SYSTEM_UI_FLAG_FULLSCREEN
+                    | android.view.View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+            }
+        }
+
+        void updateFrame(java.nio.ByteBuffer buf, int w, int h) {
+            frameView.updateFrame(buf, w, h);
+        }
+    }
+
+    private static class FrameView extends View {
+        private android.graphics.Bitmap bitmap;
+        private final android.graphics.Rect dst = new android.graphics.Rect();
+        private final android.graphics.Paint paint = new android.graphics.Paint();
+        private final Object lock = new Object();
+        private int fw, fh;
+
+        FrameView(Context context) {
+            super(context);
+            paint.setFilterBitmap(false);
+            paint.setAntiAlias(false);
+            setBackgroundColor(0xFF000000);
+        }
+
+        void updateFrame(java.nio.ByteBuffer buf, int w, int h) {
+            synchronized (lock) {
+                if (bitmap == null || fw != w || fh != h) {
+                    if (bitmap != null) bitmap.recycle();
+                    bitmap = android.graphics.Bitmap.createBitmap(w, h, android.graphics.Bitmap.Config.ARGB_8888);
+                    fw = w; fh = h;
+                }
+                buf.rewind();
+                bitmap.copyPixelsFromBuffer(buf);
+            }
+            postInvalidate();
+        }
+
+        @Override
+        protected void onDraw(android.graphics.Canvas canvas) {
+            synchronized (lock) {
+                if (bitmap == null || fw == 0 || fh == 0) return;
+                int vw = getWidth(), vh = getHeight();
+                int s = Math.min(vw / fw, vh / fh);
+                if (s < 1) s = 1;
+                int dw = fw * s, dh = fh * s;
+                int dx = (vw - dw) / 2, dy = (vh - dh) / 2;
+                dst.set(dx, dy, dx + dw, dy + dh);
+                canvas.drawColor(0xFF000000);
+                canvas.drawBitmap(bitmap, null, dst, paint);
+            }
+        }
+    }
 }

mobile/ios/overlays/love-ios.plist

@@ -5,7 +5,7 @@
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>
 	<key>CFBundleDisplayName</key>
-	<string>Pokemon Red</string>
+	<string>gen1recomp</string>
 	<key>CFBundleDocumentTypes</key>
 	<array>
 		<dict>
@@ -40,7 +40,7 @@
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>1.0</string>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>LSSupportsOpeningDocumentsInPlace</key>
@@ -49,10 +49,6 @@
 	<false/>
 	<key>UILaunchStoryboardName</key>
 	<string>Launch Screen</string>
-	<key>UIRequiredDeviceCapabilities</key>
-	<array>
-		<string>opengles-2</string>
-	</array>
 	<key>UIStatusBarHidden</key>
 	<true/>
 	<key>UIViewControllerBasedStatusBarAppearance</key>

mods/nuzlocke/README.md

@@ -0,0 +1,13 @@
+# Nuzlocke
+
+An enforced Gen 1 Nuzlocke.
+
+Oak configures Slow Start, whether duplicate evolutionary families are skipped
+or consume an area's encounter, and whether Safari maps are separate areas.
+
+After Slow Start, the mod enforces mandatory nicknames for starters, gifts,
+and catches; one capture per area; no duplicate evolutionary families; and
+permanent death. A party Pokémon says that it died and is removed immediately.
+If the final party member dies, the game runs the credits to THE END and then
+deletes the active save.
+

mods/nuzlocke/main.lua

@@ -0,0 +1,224 @@
+-- Nuzlocke rules. Uses the current engine's internal seams while the
+-- equivalent public API hooks are being added.
+return function(mod)
+  mod.hooks:wrap("intro.oak_speech.build", function(next, steps, speech)
+    steps = next(steps, speech)
+    mod.ui.insertStepAfter(steps, "oak_welcome", {
+      id = "nuzlocke_intro", kind = "say", pic = "oak",
+      text = "A Nuzlocke is a\npromise.\fEvery loss is\npermanent.",
+    })
+    mod.ui.insertStepAfter(steps, "nuzlocke_intro", {
+      id = "nuzlocke_slow_start", kind = "yesno", pic = "oak",
+      saveKey = "slow_start", defaultNo = true,
+      text = "Use SLOW START?\nRules start with\nPOKé BALLS.",
+    })
+    mod.ui.insertStepAfter(steps, "nuzlocke_slow_start", {
+      id = "nuzlocke_dupes", kind = "choice", pic = "oak",
+      saveKey = "dupes_mode", text = "When you meet a\nknown family?",
+      choices = { "SKIP", "LOSE" }, values = { "skip", "strict" },
+    })
+    mod.ui.insertStepAfter(steps, "nuzlocke_dupes", {
+      id = "nuzlocke_safari", kind = "yesno", pic = "oak",
+      saveKey = "safari_sectors", text = "Separate SAFARI\nsectors?",
+    })
+    mod.ui.insertStepAfter(steps, "nuzlocke_safari", {
+      id = "nuzlocke_close", kind = "say", pic = "oak",
+      text = "Give every friend\na name. Keep them\nsafe. Good luck!",
+    })
+    return steps
+  end)
+
+  mod.events:on("intro.oak_speech.answered", function(ev)
+    if ev.saveKey then mod.save:set(ev.saveKey, ev.value) end
+  end)
+
+  local function active(game, battle)
+    if not (game and game.save) or (battle and (battle.demo or battle.ghost)) then return false end
+    if not mod.save:get("slow_start", false) then return true end
+    if mod.save:get("balls_unlocked", false) then return true end
+    for id, count in pairs(game.save.inventory or {}) do
+      if count > 0 and game.data.items[id] and game.data.items[id].ball then
+        mod.save:set("balls_unlocked", true)
+        return true
+      end
+    end
+    return false
+  end
+
+  local function areaKey(game, battle)
+    if battle and battle.safari and not mod.save:get("safari_sectors", false) then
+      return "SAFARI_ZONE"
+    end
+    return (game.overworld and game.overworld.map and game.overworld.map.id)
+      or (game.save.player and game.save.player.map) or "UNKNOWN"
+  end
+
+  local function family(data, species)
+    local found, pending = {}, { species }
+    while #pending > 0 do
+      local id = table.remove(pending)
+      if not found[id] then
+        found[id] = true
+        for _, evo in ipairs((data.pokemon[id] or {}).evolutions or {}) do pending[#pending + 1] = evo.species end
+        for parent, def in pairs(data.pokemon or {}) do
+          for _, evo in ipairs(def.evolutions or {}) do
+            if evo.species == id then pending[#pending + 1] = parent end
+          end
+        end
+      end
+    end
+    return found
+  end
+
+  local function ownsFamily(game, species)
+    local members = family(game.data, species)
+    local function owns(mon) return mon and members[mon.species] end
+    for _, mon in ipairs(game.save.party or {}) do if owns(mon) then return true end end
+    for _, box in ipairs(game.save.boxes or {}) do
+      for _, mon in ipairs(box) do if owns(mon) then return true end end
+    end
+    return false
+  end
+
+  local function caughtAreas()
+    local areas = mod.save:get("caught_areas")
+    if type(areas) ~= "table" then areas = {}; mod.save:set("caught_areas", areas) end
+    return areas
+  end
+
+  local function denied(game, battle, species)
+    if not active(game, battle) then return nil end
+    if caughtAreas()[areaKey(game, battle)] then return "area" end
+    if ownsFamily(game, species) then return "dupes" end
+  end
+
+  mod.events:on("pokemon.caught", function(ev)
+    -- A successful capture proves that Slow Start has ended even when it was
+    -- the last ball in the bag.
+    if mod.save:get("slow_start", false) then mod.save:set("balls_unlocked", true) end
+    if active(ev.game, ev.battle) then
+      caughtAreas()[areaKey(ev.game, ev.battle)] = ev.species
+      mod.save:set("caught_areas", caughtAreas())
+    end
+  end)
+
+  mod.events:on("game.ready", function()
+    local BattleState = require("src.battle.BattleState")
+    local Commands = require("src.script.Commands")
+    local Party = require("src.pokemon.Party")
+    local Boxes = require("src.pokemon.Boxes")
+    local Pokemon = require("src.pokemon.Pokemon")
+    local Runtime = require("src.mods.Runtime")
+    local Screens = require("src.ui.Screens")
+    local Strings = require("src.core.Strings")
+    local SaveData = require("src.core.SaveData")
+    local GameVersion = require("src.core.GameVersion")
+    local Bag = require("src.inventory.Bag")
+
+    BattleState.askNicknameUI = function(self, mon)
+      self.lockedBall, self.blankForAskName = nil, false
+      return self:buildScreen("NamingScreen", {
+        title = Strings("NICKNAME?"), maxLen = 10,
+        onDone = function(name) mon.nickname = name or "A" end,
+      })
+    end
+
+    -- Gifts and starters use the same mandatory naming screen.
+    Commands.give_pokemon = function(ctx, species, level)
+      local gift = { ctx = ctx, species = species, level = level }
+      if ctx.game.mods then ctx.game.mods.events:emit("pokemon.before_give", gift) end
+      local mon = Pokemon.new(ctx.game.data, gift.species, gift.level)
+      ctx.game.stringBuffer, ctx.pendingPokemonName = ctx.game.data.pokemon[gift.species].name or gift.species, gift.species
+      BattleState.stampOT(ctx.save, mon)
+      local inParty = Party.add(ctx.save.party, mon)
+      local boxNum = inParty and nil or Boxes.deposit(ctx.save, mon)
+      if not inParty and not boxNum then ctx.lastCheck = false; return end
+      if ctx.save.pokedex then ctx.save.pokedex.seen[gift.species], ctx.save.pokedex.owned[gift.species] = true, true end
+      ctx.lastCheck, ctx.addedToParty, ctx.boxNum = true, inParty, boxNum
+      if ctx.runner then
+        Screens.push(ctx.game, "NamingScreen", {
+          title = Strings("NICKNAME?"), maxLen = 10,
+          onDone = function(name) mon.nickname = name or "A"; ctx.runner:resume() end,
+        })
+        ctx.runner:yield()
+      else mon.nickname = "A" end
+      if boxNum then
+        ctx.game.boxMonNicks, ctx.game.stringBuffer = mon.nickname, tostring(boxNum)
+        if ctx.runner then Commands.show_text(ctx, "_SentToBoxText") end
+      end
+    end
+
+    local vanillaThrowBall = BattleState.throwBall
+    BattleState.throwBall = function(self, ball)
+      local reason = denied(self.game, self, self.enemy and self.enemy.mon.species)
+      if reason then
+        if reason == "dupes" and mod.save:get("dupes_mode", "skip") == "strict" then
+          caughtAreas()[areaKey(self.game, self)] = "DUPES_LOST"
+          mod.save:set("caught_areas", caughtAreas())
+        end
+        Bag.add(self.game.save, ball, 1, self.game.data)
+        self:say(reason == "area" and "This area already\nhas a captured POKéMON!"
+          or "You already have\nthis POKéMON family!")
+        return
+      end
+      return vanillaThrowBall(self, ball)
+    end
+
+    local vanillaOnFaint = BattleState.onFaint
+    BattleState.onFaint = function(self, battler)
+      if not (battler.isPlayer and active(self.game, self)) then return vanillaOnFaint(self, battler) end
+      if battler.faintQueued then return end
+      battler.faintQueued = true
+      if self.participants then self.participants[battler.mon] = nil end
+      Runtime.emit("battle.fainted", { battle = self, battler = battler })
+      for i, mon in ipairs(self.game.save.party) do
+        if mon == battler.mon then table.remove(self.game.save.party, i); break end
+      end
+      self:actNext(function()
+        battler.fainted = true
+        require("src.core.Sound").playCry(self.data, battler.mon.species)
+        require("src.core.Sound").play(self.data, "Faint_Fall")
+        self.fx = self.fx or {}; self.fx.faint = { battler = battler, frames = 30 }
+      end)
+      self.nextInsert = (self.nextInsert or 0) + 1
+      table.insert(self.queue, self.nextInsert, { wait = 30 })
+      self:sayNext(Strings("%s\ndied!", battler.name))
+      self:act(function() self:playerMonFainted() end)
+    end
+
+    local vanillaPlayerFainted = BattleState.playerMonFainted
+    BattleState.playerMonFainted = function(self)
+      if active(self.game, self) and not Party.firstHealthy(self.game.save.party) then
+        self.nuzlockeGameOver, self.result, self.afterQueue = true, "nuzlocke_game_over", "finish"
+        self:sayNext(Strings("All of your\nPOKéMON are dead..."))
+        return
+      end
+      return vanillaPlayerFainted(self)
+    end
+
+    local vanillaFinish = BattleState.finish
+    BattleState.finish = function(self)
+      if not self.nuzlockeGameOver then return vanillaFinish(self) end
+      self.nuzlockeGameOver = nil
+      self.game.stack:pop()
+      Runtime.emit("battle.ended", { battle = self, result = "nuzlocke_game_over" })
+      -- Game over has no victory lap: delete the slot, then use Credits only
+      -- as its existing THE END renderer / A-or-B wait screen.
+      local version = GameVersion.get()
+      local slot = SaveData.activeSlot(version)
+      if slot then SaveData.deleteSlot(version, slot)
+      elseif love and love.filesystem then
+        local main = SaveData.saveFilename(version)
+        love.filesystem.remove(main); love.filesystem.remove(main .. ".bak"); love.filesystem.remove(main .. ".tmp")
+      end
+      local ending = Screens.push(self.game, "Credits", function()
+        require("src.core.Music").stop()
+        while self.game.stack:top() do self.game.stack:pop() end
+        Screens.push(self.game, "IntroMovie", function()
+          if self.game.makeTitleState then self.game.stack:push(self.game:makeTitleState()) end
+        end)
+      end)
+      ending.phase, ending.timer = "end_wait", 0
+    end
+  end)
+end

mods/nuzlocke/manifest.json

@@ -0,0 +1,19 @@
+{
+  "id": "nuzlocke",
+  "name": "Nuzlocke",
+  "version": "1.0.0",
+  "api": 2,
+  "entry": "main.lua",
+  "profile": "content",
+  "category": "GAMEPLAY",
+  "game_version": ">=0.0.0-dev <1.0.0",
+  "priority": 100,
+  "permissions": [
+    "engine_internals"
+  ],
+  "dependencies": [],
+  "optional_dependencies": [],
+  "conflicts": [],
+  "description": "A configurable Gen 1 Nuzlocke with permanent death and area catches.",
+  "github": "bryanthaboi/nuzlocke"
+}

mods/pokewalker/CHANGELOG.md

@@ -1,17 +0,0 @@
-# Changelog
-
-All notable changes to this mod are documented here. Format follows
-[Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
-
-## [1.0.0] - 2026-07-30
-
-### Added
-
-- Opt-in SYNC STEPS option: Apple Health step counts (delivered by the iOS
-  build's native bridge as `steps_pending.json`) convert to EXP.
-- STEPS PER EXP option (10 / 20 / 50, default 20).
-- GIVE EXP TO option: lead mon (default) or whole party split.
-- Level-ups applied with the engine's growth curves and rare-candy stat
-  math; walk-report textbox at quiet moments.
-- Guardrails: steps anchored to the last sync (never credited twice),
-  50,000-step clamp per sync, engine `levelCap` respected.

mods/pokewalker/README.md

@@ -1,92 +0,0 @@
-# Pokéwalker (Apple Health) — a Gen1Recomp mod
-
-Your real-world steps become EXP for your Pokémon party — the HeartGold/
-SoulSilver Pokéwalker, except it's the iPhone already in your pocket.
-
-A mod for [gen1recomp](https://github.com/bryanthaboi/gen1recomp)
-(the Gen 1 Recompilation Project). Opt-in, data-safe, and dormant on any
-platform that doesn't provide the native step source (see
-[Requirements](#requirements)).
-
-## Install
-
-Grab `pokewalker-<version>.modpkg` from
-[Releases](https://github.com/mresnick67/Gen1ReComp-Pokewalker/releases)
-(or use GitHub's *Code → Download ZIP* — the importer handles both), then:
-
-- **In the launcher:** MODS tab → **Import mod .zip** → pick the file, or
-  drag it onto the window on desktop.
-- **iOS:** you can also drop the zip into the app's folder in the Files
-  app; it installs on next launch.
-
-Then, in the **mod manager → POKEWALKER → options**, turn on **SYNC
-STEPS**. iOS asks for read-only access to your step count the first time.
-
-## Options
-
-| Option | Values | Default |
-|---|---|---|
-| SYNC STEPS | on / off | **off** |
-| STEPS PER EXP | 10 / 20 / 50 | 20 |
-| GIVE EXP TO | lead mon / whole party (split) | lead mon |
-
-## Mechanics & guardrails
-
-- EXP applies through the engine's own growth curves and rare-candy stat
-  math, so levels, stats, and HP top-ups are exact.
-- Steps are anchored to the last sync — the same walk is never credited
-  twice — and any single sync is clamped to 50,000 steps.
-- The engine `levelCap` constant is respected.
-- Credits land at quiet moments (save load, map change, battle end) with a
-  walk-report textbox.
-
-## Requirements
-
-The Lua mod is platform-neutral, but it feeds on a **native step bridge**
-that currently ships in an iOS build of gen1recomp. Without the bridge the
-mod loads and stays dormant — safe to install anywhere.
-
-### The bridge contract (for porters)
-
-Any platform can light this mod up by providing:
-
-- `love.system.syncHealthSteps()` → `boolean` — kick off an async step
-  query (requesting OS permission on first use). On completion, write
-  **`steps_pending.json`** to the LÖVE save directory:
-
-  ```json
-  { "steps": 4312, "from": "2026-07-30T08:00:00Z", "to": "2026-07-30T17:00:00Z" }
-  ```
-
-  Count steps from a persisted anchor (last successful sync) so a walk is
-  never delivered twice, and **merge** with an unconsumed pending file
-  rather than overwriting it. The mod consumes and deletes the file.
-
-The reference iOS implementation is a small Swift class (HealthKit
-`HKStatisticsQuery` over `stepCount`) exposed to Lua through a one-line
-`wrap_System.cpp` addition. Open an issue here if you're porting the
-bridge (Android: Health Connect / Google Fit would slot straight in).
-
-## Known limitations (v1)
-
-- Level-ups granted while walking don't prompt for new moves, and level
-  evolutions wait for the next in-battle level — same behavior as
-  over-leveling with rare candies.
-- Steps sync on launch/activation; no background delivery yet.
-
-## Developing
-
-From a gen1recomp checkout with this mod at `mods/pokewalker` and an
-imported data cache:
-
-```sh
-luajit mods/pokewalker/tests/pokewalker_test.lua
-python3 tools/modkit.py validate mods/pokewalker --base imported
-python3 tools/modkit.py pack mods/pokewalker
-```
-
-## License
-
-MIT — see [LICENSE](LICENSE). Not affiliated with Nintendo, Game Freak,
-or The Pokémon Company. This mod contains no ROM-derived content
-(`modkit lint` clean).

mods/pokewalker/main.lua

@@ -1,144 +0,0 @@
--- Pokéwalker: Apple Health steps become party EXP (iOS builds).
---
--- The Swift side (mobile/ios/native/GRHealthBridge.swift) owns HealthKit:
--- love.system.syncHealthSteps() requests read access on first use, counts
--- steps since the last sync anchor, and drops steps_pending.json in the
--- save dir.  This mod consumes that file at quiet moments (save loaded, map
--- transitions, battle end), converts steps to EXP, and applies level-ups
--- with the same stat math the engine uses.
---
--- Opt-in: everything is inert until SYNC STEPS is enabled in this mod's
--- options (the HealthKit permission sheet appears on first enable).  On
--- non-iOS platforms love.system.syncHealthSteps does not exist and the mod
--- stays dormant.
---
--- Known v1 limits (documented in README.md): level-ups applied here do not
--- prompt for new moves (like over-leveling past a learnset entry with rare
--- candies) and do not trigger level evolutions until the next battle candy
--- or level gained in battle.
-
-local PENDING = "steps_pending.json"
-
-return function(mod)
-  mod.options:define({
-    { key = "enabled", label = "SYNC STEPS", type = "toggle", default = false },
-    { key = "rate", label = "STEPS PER EXP", type = "choice", default = "20",
-      choices = { { "10", "10" }, { "20", "20" }, { "50", "50" } } },
-    { key = "target", label = "GIVE EXP TO", type = "choice", default = "lead",
-      choices = { { "LEAD MON", "lead" }, { "WHOLE PARTY", "party" } } },
-  })
-
-  local Json = require("src.link.Json")
-  local Growth = require("src.pokemon.Growth")
-  local Stats = require("src.pokemon.Stats")
-  local game
-
-  local function active()
-    return love.system.syncHealthSteps ~= nil and mod.options:get("enabled")
-  end
-
-  -- Ask the native side to refresh steps_pending.json.  Async: results are
-  -- picked up by a later consume() (next map change / battle end).
-  local function requestSync()
-    if active() then love.system.syncHealthSteps() end
-  end
-
-  -- Add EXP to one mon, bumping levels with the engine's own stat math
-  -- (mirrors the rare-candy path in src/inventory/ItemEffects.lua).
-  -- Returns the EXP actually absorbed and any levels gained.
-  local function applyToMon(mon, xp, data)
-    local def = data.pokemon[mon.species]
-    if not def or not mon.level then return 0, {} end
-    local cap = (data.constants and data.constants.levelCap) or 100
-    if mon.level >= cap then return 0, {} end
-    local maxExp = Growth.expForLevel(def.growthRate, cap, data.growth_rates)
-    local before = mon.exp or 0
-    mon.exp = math.min(maxExp, before + xp)
-    local absorbed = mon.exp - before
-    if absorbed <= 0 then return 0, {} end
-    local levels = {}
-    local newLevel = Growth.levelForExp(def.growthRate, mon.exp, cap,
-                                        data.growth_rates)
-    while mon.level < newLevel do
-      mon.level = mon.level + 1
-      local old = mon.stats
-      mon.stats = Stats.calc(def, mon.level, mon.dvs, mon.statExp)
-      mon.hp = math.min(mon.stats.hp,
-                        (mon.hp or 0) + (mon.stats.hp - (old and old.hp or 0)))
-      levels[#levels + 1] = mon.level
-    end
-    return absorbed, levels
-  end
-
-  -- A short walk-report textbox, shown only when the overworld is idle;
-  -- when a script is already running the report is silently skipped (the
-  -- EXP is applied regardless, and the log has the numbers).
-  local function report(steps, total, leveled)
-    local msg = ("You walked %d steps!\nYour party gained %d EXP."):format(steps, total)
-    if #leveled > 0 then
-      msg = msg .. ("\n%s grew to L%d!"):format(leveled[1].name, leveled[1].level)
-    end
-    -- The report is decoration: it must never break the credit.  mod.world
-    -- materializes lazily (and can itself error in headless contexts), so
-    -- the access lives inside the pcall too.
-    pcall(function()
-      local world = mod.world
-      if world then world:queueScript({ { "show_text", msg } }) end
-    end)
-  end
-
-  local function consume()
-    if not (game and active()) then return end
-    local raw = love.filesystem.read(PENDING)
-    if not raw then return end
-    local decoded = Json.decode(raw)
-    local steps = decoded and tonumber(decoded.steps) or 0
-    love.filesystem.remove(PENDING)
-    if steps <= 0 then return end
-
-    local party = game.save and game.save.party
-    if not party or #party == 0 then return end
-    local rate = tonumber(mod.options:get("rate")) or 20
-    local xp = math.floor(steps / rate)
-    if xp <= 0 then return end
-
-    local total, leveled = 0, {}
-    local targets = {}
-    if mod.options:get("target") == "party" then
-      for _, mon in ipairs(party) do targets[#targets + 1] = mon end
-    else
-      targets[1] = party[1]
-    end
-    local share = math.max(1, math.floor(xp / #targets))
-    for _, mon in ipairs(targets) do
-      local absorbed, levels = applyToMon(mon, share, game.data)
-      total = total + absorbed
-      for _, level in ipairs(levels) do
-        leveled[#leveled + 1] =
-          { name = mon.nickname or mon.species, level = level }
-      end
-    end
-    if total <= 0 then return end
-    mod.log:info("credited %d steps -> %d EXP (%d level-ups)",
-                 steps, total, #leveled)
-    report(steps, total, leveled)
-  end
-
-  -- game.ready is the sanctioned way to obtain the Game object; the party
-  -- only exists once a save is loaded or created.
-  mod.events:on("game.ready", function(payload)
-    game = payload.game
-    requestSync()
-  end)
-  mod.events:on("save.loaded", function()
-    requestSync()
-    consume()
-  end)
-  mod.events:on("save.created", function() requestSync() end)
-  -- Quiet moments where a walk report can safely appear.
-  mod.events:on("map.entered", function() consume() end)
-  mod.events:on("battle.ended", function() consume() end)
-  -- Flipping SYNC STEPS on triggers the HealthKit permission sheet
-  -- immediately rather than on the next boot.
-  mod.events:on("mod.options_changed", function() requestSync() end)
-end

mods/pokewalker/manifest.json

@@ -1,16 +0,0 @@
-{
-  "id": "pokewalker",
-  "name": "Pokewalker (Apple Health)",
-  "version": "1.0.0",
-  "api": 2,
-  "entry": "main.lua",
-  "profile": "content",
-  "category": "MECHANIC",
-  "game_version": ">=0.0.0-0 <2.0.0",
-  "permissions": ["network", "engine_internals"],
-  "priority": 100,
-  "dependencies": [],
-  "optional_dependencies": [],
-  "conflicts": [],
-  "description": "Your real-world steps (Apple Health) become EXP for your party. Opt-in: enable SYNC STEPS in this mod's options. Needs an iOS build with the Health bridge; dormant elsewhere."
-}

mods/pokewalker/mod.card

@@ -1,33 +0,0 @@
--- Sharing metadata (25-community-and-ecosystem.md 3.2).  Read by tooling
--- and the manager detail pane; never by the loader's merge.
-return {
-  summary = "Real-world steps from Apple Health become EXP for your party.",
-  author = "mresnick67",
-  contact = "https://github.com/mresnick67/Gen1ReComp-Pokewalker",
-  tags = { "mechanic", "ios", "health", "opt-in", "field" },
-  differences = {
-    changed = {},
-    added = {
-      "an opt-in SYNC STEPS option: Apple Health step counts convert to "
-        .. "EXP at a configurable rate (10/20/50 steps per EXP)",
-      "EXP lands on the lead mon or splits across the party, applied with "
-        .. "the engine's own growth curves and rare-candy stat math",
-      "a walk-report textbox at quiet moments (save load, map change, "
-        .. "battle end)",
-    },
-    known = {
-      "needs an iOS build that ships the native Health bridge "
-        .. "(love.system.syncHealthSteps); on every other platform the mod "
-        .. "loads but stays dormant",
-      "level-ups granted while walking do not prompt for new moves and do "
-        .. "not trigger level evolutions until the next in-battle level "
-        .. "(same as over-leveling with rare candies)",
-      "steps sync on launch/activation; no background delivery yet",
-    },
-  },
-  credits = {
-    { who = "Nintendo's Pokewalker (HGSS)", for_ = "the idea this recreates" },
-    { who = "bryanthaboi/gen1recomp", for_ = "the engine and mod platform" },
-  },
-  compat = { engine = ">=1.0.0 <2.0.0", modApi = 2 },
-}

mods/pokewalker/tests/pokewalker_test.lua

@@ -1,61 +0,0 @@
--- Standalone: luajit mods/pokewalker/tests/pokewalker_test.lua
--- Exercises the stated effect: opt-in gating, the native-bridge seam, and
--- steps converting to EXP through the engine's own growth math.
---
--- Shipped-mod suites are auto-run by the ROM-free T4 tier, so this runs
--- against the committed fixture dataset (T.fixtures), never data/generated.
-package.path = "./?.lua;./?/init.lua;" .. package.path
-
-local T = require("tests.modkit")
-local Data = T.fixtures.fresh()
-
--- The native step bridge only exists inside the iOS/Android apps; stand it
--- in so the mod sees the same surface it does on device.
-local syncCalls = 0
-love.system = love.system or {}
-love.system.syncHealthSteps = function()
-  syncCalls = syncCalls + 1
-  return true
-end
-
-local run = T.sdk.loadMod("mods/pokewalker", { data = Data })
-T.eq(#run.errors, 0, "loads clean (" .. tostring(run.errors[1]) .. ")")
-
-local events = run.loader.events
-local Growth = require("src.pokemon.Growth")
-local Pokemon = require("src.pokemon.Pokemon")
-local mon = Pokemon.new(Data, "FIXMON_A", 5)
-local game = { data = Data, save = { party = { mon } } }
-
--- Dormant until opted in: seeded steps survive every event untouched and
--- the native bridge is never poked (no permission prompt without consent).
-love.filesystem.write("steps_pending.json", '{"steps": 20000}')
-events:emit("game.ready", { game = game })
-events:emit("map.entered", {})
-T.check(love.filesystem.read("steps_pending.json") ~= nil,
-  "opt-out leaves pending steps untouched")
-T.eq(syncCalls, 0, "opt-out never calls the native bridge")
-
--- Opted in: 20000 steps at the default 20 steps/EXP credit the lead mon.
-run.loader.modOptions.pokewalker = { enabled = true }
-local def = Data.pokemon[mon.species]
-local expBefore = mon.exp
-events:emit("save.loaded", {})
-T.eq(mon.exp, expBefore + 1000, "20000 steps at 20 steps/EXP = +1000 EXP")
-local expectedLevel = Growth.levelForExp(def.growthRate, mon.exp, 100,
-                                         Data.growth_rates)
-T.check(mon.level > 5, "enough EXP to actually level (fixture curve)")
-T.eq(mon.level, expectedLevel, "level matches the engine growth curve")
-T.check(mon.stats.hp > 0 and mon.hp <= mon.stats.hp,
-  "stat recalc keeps HP within the new maximum")
-T.check(love.filesystem.read("steps_pending.json") == nil,
-  "pending file is consumed exactly once")
-T.check(syncCalls > 0, "opt-in requests a native sync")
-
--- A consumed file plus more events must not double-credit.
-local expAfter = mon.exp
-events:emit("map.entered", {})
-T.eq(mon.exp, expAfter, "no pending file, no phantom EXP")
-
-run.release()
-T.finish("pokewalker")

scripts/build.sh

@@ -35,6 +35,7 @@ TARGET="all"
 NOTARY_PROFILE="notary-profile"
 NOTARIZE=true
 IOS_RELEASE=false
+IOS_IPA=false
 
 say()  { printf '\033[1;32m==>\033[0m %s\n' "$*"; }
 warn() { printf '\033[1;33mwarn:\033[0m %s\n' "$*" >&2; }
@@ -48,6 +49,7 @@ while [ $# -gt 0 ]; do
     --notary-profile) NOTARY_PROFILE="$2"; shift ;;
     --no-notarize) NOTARIZE=false ;;
     --release) IOS_RELEASE=true ;;
+    --ipa) IOS_IPA=true ;;
     *) fail "unknown argument: $1" ;;
   esac
   shift
@@ -298,6 +300,9 @@ build_android() {
   if [ "$VERSION_EXPLICIT" = true ]; then
     args+=(--version "$VERSION")
   fi
+  if [ "$IOS_IPA" = true ]; then
+    args+=(--ipa)
+  fi
   "$ROOT/scripts/build_android.sh" ${args[@]+"${args[@]}"}
 }
 
@@ -308,6 +313,9 @@ build_ios() {
   if [ "$IOS_RELEASE" = true ]; then
     args+=(--release)
   fi
+  if [ "$VERSION_EXPLICIT" = true ]; then
+    args+=(--version "$VERSION")
+  fi
   "$ROOT/scripts/build_ios.sh" ${args[@]+"${args[@]}"}
 }
 

scripts/build_android.sh

@@ -198,6 +198,10 @@ pack_game_love() {
   rm -f "$LOVE_FILE"
   # tools/save-editor ships with the app: the launcher's Edit button on a save
   # row opens it in-process, so it must be inside the archive (see build.sh).
+  # Deliberately NO fused mods: a mod inside game.love sits in the read-only
+  # APK, so the mod manager's Delete can't remove it and it reappears every
+  # launch.  Pokewalker ships as an importable .zip instead, which gives it
+  # a real install/upgrade/delete lifecycle.
   (cd "$ROOT" && zip -q -9 -r "$LOVE_FILE" \
     main.lua conf.lua src data assets tools/save-editor \
     tools/rom_manifest.json tools/rom_manifest_blue.json \
@@ -290,10 +294,32 @@ require_android_sdk() {
 # --------------------------------------------------------------- gradle
 run_gradle() {
   local task="assembleEmbedNoRecordDebug"
-  say "building APK ($task)"
+  local build_dir="$ANDROID_DIR"
 
+  # ndk-build is GNU make underneath and cannot cope with spaces anywhere in
+  # the project path ("Your APP_BUILD_SCRIPT points to an unknown file").
+  # When this checkout lives at a spaced path (e.g. "~/xCode Projects/..."),
+  # shadow the android tree to a space-free location and build there; the
+  # shadow persists across runs so gradle/ndk builds stay incremental.
+  case "$ANDROID_DIR" in
+    *" "*)
+      build_dir="${TMPDIR:-/tmp}/gen1recomp-android-shadow"
+      say "path contains spaces (ndk-build cannot handle them);"
+      say "shadow-building in: $build_dir"
+      mkdir -p "$build_dir"
+      rsync -a --delete \
+        --exclude=".gradle" --exclude="app/build" --exclude="love/build" \
+        --exclude="local.properties" \
+        "$ANDROID_DIR/" "$build_dir/"
+      if [ -f "$ANDROID_DIR/local.properties" ]; then
+        cp "$ANDROID_DIR/local.properties" "$build_dir/local.properties"
+      fi
+      ;;
+  esac
+
+  say "building APK ($task)"
   if ! (
-    cd "$ANDROID_DIR"
+    cd "$build_dir"
     ./gradlew --no-daemon "$task"
   ); then
     fail "gradle $task failed.
@@ -302,7 +328,7 @@ run_gradle() {
   You can still iterate on the .love payload with: scripts/build_android.sh --package-only"
   fi
 
-  local out_dir="$ANDROID_DIR/app/build/outputs/apk/embedNoRecord/debug"
+  local out_dir="$build_dir/app/build/outputs/apk/embedNoRecord/debug"
   if [ -d "$out_dir" ]; then
     say "APK output:"
     find "$out_dir" -name '*.apk' -exec ls -lh {} \;

scripts/build_ios.sh

@@ -2,7 +2,8 @@
 # Packages the LÖVE2D Pokémon Red port into an iOS app via LÖVE 11.5's
 # official iOS Xcode project (love-11.5-ios-source.zip).
 #
-# Usage: scripts/build_ios.sh [--fetch] [--device] [--release] [--package-only]
+# Usage: scripts/build_ios.sh [--fetch] [--device] [--release] [--install]
+#                             [--version X.Y.Z] [--package-only]
 #
 #   (default)         Simulator Debug (ad-hoc signed)
 #   --device          iphoneos SDK; signing team auto-detected from the
@@ -10,6 +11,7 @@
 #   --install         after a --device build, install the app onto the
 #                     first connected iPhone/iPad (unlock it first)
 #   --release         Release configuration
+#   --version X.Y.Z   stamp MARKETING_VERSION / CURRENT_PROJECT_VERSION
 #   --fetch           Download love-11.5-ios-source.zip into mobile/ios/love-src/
 #   --package-only    Zip game.love + apply plist overlay; skip xcodebuild
 #
@@ -19,6 +21,7 @@
 #   - prebuilt iOS libraries under love-src/platform/xcode/ios/libraries/
 #
 # Output: dist/ios/<Config>-<sdk>/gen1recomp.app (convenience copy)
+#         dist/ios/gen1recomp.ipa                 (device builds only)
 #         mobile/ios/build/Build/Products/<Config>-<sdk>/gen1recomp.app
 
 set -euo pipefail
@@ -47,7 +50,7 @@ DISPLAY_NAME="gen1recomp"
 #      capabilities like HealthKit are involved), so a per-team default
 #      lets anyone build without colliding with someone else's app
 #   4. simulator: the project default (no App ID registration involved)
-BUNDLE_ID="${GEN1_BUNDLE_ID:-}"
+BUNDLE_ID="${GEN1_BUNDLE_ID:-com.theboisclub.gen1recomp}"
 if [ -z "$BUNDLE_ID" ] && [ -f "$IOS_DIR/bundle_id.local" ]; then
   BUNDLE_ID="$(tr -d '[:space:]' < "$IOS_DIR/bundle_id.local")"
 fi
@@ -62,6 +65,12 @@ DEVICE=false
 RELEASE=false
 PACKAGE_ONLY=false
 INSTALL=false
+CREATE_IPA=false
+# Last resort for an incomplete source export, mirroring build_android.sh.
+MANIFEST_BASE_URL="${MANIFEST_BASE_URL:-https://raw.githubusercontent.com/bryanthaboi/gen1recomp/main}"
+MANIFESTS=""
+
+VERSION=""
 
 say()  { printf '\033[1;32m==>\033[0m %s\n' "$*"; }
 warn() { printf '\033[1;33mwarn:\033[0m %s\n' "$*" >&2; }
@@ -74,23 +83,48 @@ while [ $# -gt 0 ]; do
     --release) RELEASE=true ;;
     --package-only) PACKAGE_ONLY=true ;;
     --install) INSTALL=true ;;
+    --ipa) CREATE_IPA=true ;;
+    --version) VERSION="$2"; shift ;;
     -h|--help)
-      sed -n '2,22p' "$0"
+      sed -n '2,24p' "$0"
       exit 0
       ;;
-    *) fail "unknown argument: $1 (try --fetch, --device, --release, --install, or --package-only)" ;;
+    *) fail "unknown argument: $1 (try --fetch, --device, --release, --version, --install, or --package-only)" ;;
   esac
   shift
 done
 
+if $CREATE_IPA; then
+  DEVICE=true
+fi
+
+VERSION_CODE=""
+if [ -n "$VERSION" ]; then
+  if ! printf '%s' "$VERSION" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$'; then
+    fail "invalid --version '$VERSION' (expected X.Y.Z)"
+  fi
+  major="${VERSION%%.*}"
+  rest="${VERSION#*.}"
+  minor="${rest%%.*}"
+  patch="${rest##*.}"
+  VERSION_CODE=$((major * 10000 + minor * 100 + patch))
+fi
+
 # ---------------------------------------------------------- signing identity
-# Auto-detect the Apple Development team when the caller didn't set one: the
-# OU field of the first Apple Development certificate in the keychain (Xcode
-# creates that certificate when you sign into Settings -> Accounts).
+# Auto-detect the Apple Development team when the caller didn't set one.
+# Prefer a *valid* identity from `find-identity` (the parenthetical there is
+# the cert id, not the team), then read that cert's OU. Scanning every
+# "Apple Development" certificate picks expired personal/work certs first.
 detect_team() {
-  security find-certificate -c "Apple Development" -p 2>/dev/null \
+  local cn
+  cn="$(security find-identity -v -p codesigning 2>/dev/null \
+    | sed -n -E 's/.*"Apple Development: ([^"]+)".*/\1/p' \
+    | head -1)"
+  [ -n "$cn" ] || return 1
+  security find-certificate -c "Apple Development: $cn" -p 2>/dev/null \
     | openssl x509 -noout -subject 2>/dev/null \
-    | sed -n 's/.*OU *= *\([A-Z0-9]*\).*/\1/p' | head -1
+    | sed -n 's/.*OU *= *\([A-Z0-9]*\).*/\1/p' \
+    | head -1
 }
 if $DEVICE && [ -z "${DEVELOPMENT_TEAM:-}" ]; then
   DEVELOPMENT_TEAM="$(detect_team || true)"
@@ -204,20 +238,108 @@ apply_ios_branding() {
   cp "$OVERLAY_PLIST" "$dest"
 }
 
+apply_ios_icon() {
+  local source="$ROOT/assets/logo/logo.png"
+  local target="$XCODE_DIR/Images.xcassets/iOS AppIcon.appiconset"
+  [ -f "$source" ] || fail "missing iOS icon source: $source"
+  [ -d "$target" ] || fail "missing iOS app icon set: $target"
+  local entry name size
+  while IFS=: read -r name size; do
+    sips -z "$size" "$size" "$source" --out "$target/$name" >/dev/null
+  done <<'EOF'
+icon-1024pt@1x.png:1024
+icon-29pt@1x.png:29
+icon-29pt@2x.png:58
+icon-29pt@3x.png:87
+icon-40pt@1x.png:40
+icon-40pt@2x.png:80
+icon-40pt@3x.png:120
+icon-60pt@2x.png:120
+icon-60pt@3x.png:180
+icon-76pt@1x.png:76
+icon-76pt@2x.png:152
+icon-83.5pt@2x.png:167
+EOF
+}
+
 # --------------------------------------------------------------- game.love
+# Every version's import manifest has to ship or that game's ROM import fails in
+# the built app: decodeManifest (src/import/RomImporter.lua) errors outright when
+# one is absent, and dev reads them off the source tree, so the miss only ever
+# shows up in a build.  iOS shipped without the Yellow one in 0.1.45 to 0.1.47
+# for exactly that reason.
+#
+# The list is READ OUT OF src/core/GameVersion.lua rather than hand-kept here, so
+# a fourth version cannot silently ship without its manifest, and a missing file
+# is recovered from Git or the project repo the same way build_android.sh already
+# recovers Yellow's.  Recovery is a last resort for an incomplete source export:
+# a manifest carries extraction metadata only, never a ROM or game data.
+manifest_paths() {
+  python3 - "$ROOT/src/core/GameVersion.lua" <<'PY'
+import re, sys
+src = open(sys.argv[1]).read()
+print(" ".join(dict.fromkeys(re.findall(r'manifest\s*=\s*"([^"]+)"', src))))
+PY
+}
+
+manifest_is_valid() {
+  python3 - "$1" <<'PY'
+import json, pathlib, sys
+try:
+    m = json.loads(pathlib.Path(sys.argv[1]).read_text())
+except (OSError, ValueError):
+    raise SystemExit(1)
+sha = m.get("romSha1")
+raise SystemExit(0 if isinstance(sha, str) and len(sha) == 40 else 1)
+PY
+}
+
+ensure_manifests() {
+  MANIFESTS="$(manifest_paths)"
+  [ -n "$MANIFESTS" ] \
+    || fail "could not read any manifest path out of src/core/GameVersion.lua"
+  local rel staged
+  for rel in $MANIFESTS; do
+    if manifest_is_valid "$ROOT/$rel"; then continue; fi
+    warn "$rel is missing or invalid; recovering it before packaging"
+    staged="$(mktemp)"
+    if git -C "$ROOT" show "HEAD:$rel" > "$staged" 2>/dev/null \
+        && manifest_is_valid "$staged"; then
+      mkdir -p "$ROOT/$(dirname "$rel")"
+      mv "$staged" "$ROOT/$rel"
+      say "restored $rel from this checkout's Git data"
+      continue
+    fi
+    if command -v curl >/dev/null 2>&1 \
+        && curl --fail --location --retry 2 --connect-timeout 15 \
+            --output "$staged" "$MANIFEST_BASE_URL/$rel" \
+        && manifest_is_valid "$staged"; then
+      mkdir -p "$ROOT/$(dirname "$rel")"
+      mv "$staged" "$ROOT/$rel"
+      say "downloaded $rel from the project repository"
+      continue
+    fi
+    rm -f "$staged"
+    fail "$rel is unavailable: Git recovery failed and $MANIFEST_BASE_URL/$rel could not be downloaded"
+  done
+  say "import manifests: $MANIFESTS"
+}
+
 pack_game_love() {
   say "packing game.love for love-ios resources"
   mkdir -p "$RESOURCES_DIR"
   rm -f "$LOVE_FILE"
   # Same payload as scripts/build.sh / build_android.sh: game sources plus
   # tools/save-editor, which the launcher's Edit button opens in-process.
-  # mods/pokewalker rides inside game.love on iOS only: physfs merges the
-  # fused archive with the save dir, so the loader discovers it like any
-  # installed mod, and its Apple Health sync is a no-op everywhere else.
+  # Deliberately NO fused mods: a mod inside game.love sits in the
+  # read-only app bundle, so the mod manager's Delete can't remove it and
+  # it reappears every launch.  Mods install as .zips at runtime instead
+  # (launcher -> MODS -> Import mod .zip), the same lifecycle as every
+  # other platform.
+  # shellcheck disable=SC2086  # MANIFESTS is a deliberate word list
   (cd "$ROOT" && zip -q -9 -r "$LOVE_FILE" \
     main.lua conf.lua src data assets tools/save-editor \
-    tools/rom_manifest.json tools/rom_manifest_blue.json \
-    mods/pokewalker \
+    $MANIFESTS \
     -x '*.DS_Store' -x '*/.git/*' -x '*/.DS_Store' \
     -x 'data/generated/*' -x 'assets/generated/*')
   # NOTE: grep -q here would race pipefail — it exits on first match, unzip
@@ -227,8 +349,19 @@ pack_game_love() {
       | grep -E '^(data|assets)/generated/[^/]+|^(data|assets)/generated/.+/' >/dev/null; then
     fail "game.love unexpectedly contains generated ROM data"
   fi
-  unzip -Z1 "$LOVE_FILE" | grep -x 'tools/save-editor/App.lua' >/dev/null \
-    || fail "game.love is missing the save editor (Edit on a save row would crash)"
+  # Same required-file gate as scripts/build.sh and scripts/build_android.sh.
+  # iOS only checked App.lua, which is why the Yellow manifest shipped missing
+  # in 0.1.45 through 0.1.47: decodeManifest (src/import/RomImporter.lua) errors
+  # outright when a version's manifest is absent, so Import ROM on Yellow died
+  # in the built app while dev, which reads the source tree, stayed green.
+  archive_entries="$(unzip -Z1 "$LOVE_FILE")"
+  # shellcheck disable=SC2086  # MANIFESTS is a deliberate word list
+  for required in src/update/Boot.lua tools/save-editor/App.lua \
+                  tools/save-editor/Kit.lua tools/save-editor/panels/Party.lua \
+                  $MANIFESTS; do
+    printf '%s\n' "$archive_entries" | grep -qx "$required" \
+      || fail "game.love is missing $required"
+  done
   say "game.love: $(du -h "$LOVE_FILE" | cut -f1) -> $LOVE_FILE"
 }
 
@@ -323,6 +456,43 @@ PY
 }
 
 # --------------------------------------------------------------- xcodebuild
+# love.system.pickFile and createFile are a native bridge compiled in by
+# mobile/ios/patch_love_src.py, not part of LÖVE.  A build that skipped the
+# patch still links and still runs, then finds the field nil the moment anyone
+# taps Import ROM (#482).  #539 made that degrade to the copy-into-Files flow
+# rather than crash, which is the right floor, but a build with no picker at all
+# is a silent downgrade, so fail here instead of shipping one.
+#
+# Checked against the built binary rather than the source, because patching
+# love-src proves nothing about what Xcode actually compiled: the shipped
+# 0.1.45/0.1.46/0.1.47 IPAs all DO carry the bridge, so the reports that blamed
+# a missing patch step were self-built IPAs, exactly the case this catches.
+verify_native_bridge() {
+  local app="$1"
+  local exe bin missing=""
+  exe="$(/usr/libexec/PlistBuddy -c 'Print :CFBundleExecutable' \
+         "$app/Info.plist" 2>/dev/null || true)"
+  bin="$app/${exe:-love}"
+  [ -f "$bin" ] || bin="$app/love"
+  if [ ! -f "$bin" ]; then
+    warn "no executable inside $(basename "$app"); skipping native bridge check"
+    return 0
+  fi
+  # grep -q here would race pipefail the same way pack_game_love documents:
+  # it exits on first match, strings dies of SIGPIPE, the pipeline "fails"
+  # nondeterministically.  >/dev/null keeps grep reading the whole stream.
+  for sym in pickFile createFile; do
+    strings -a "$bin" | grep -x "$sym" >/dev/null || missing="$missing $sym"
+  done
+  if [ -n "$missing" ]; then
+    fail "built app has no native bridge (missing:$missing).
+  Import ROM would fall back to copy-into-Files instead of opening the picker.
+  mobile/ios/patch_love_src.py did not take. Re-run:
+    scripts/build_ios.sh --fetch && scripts/build_ios.sh"
+  fi
+  say "native bridge present (pickFile, createFile)"
+}
+
 run_xcodebuild() {
   local config sdk destination
   if $RELEASE; then
@@ -343,6 +513,15 @@ run_xcodebuild() {
 
   # Prefer -target + SYMROOT over -derivedDataPath: modern Xcode requires
   # -scheme whenever -derivedDataPath is set, and love-ios ships no shared schemes.
+  # Always stamp both: the overlay plist expands $(MARKETING_VERSION) /
+  # $(CURRENT_PROJECT_VERSION), and love-ios has no project-level defaults.
+  local marketing_version="$LOVE_VERSION"
+  local project_version="1"
+  if [ -n "$VERSION" ]; then
+    marketing_version="$VERSION"
+    project_version="$VERSION_CODE"
+  fi
+
   local args=(
     -project "$PROJECT"
     -target love-ios
@@ -352,7 +531,8 @@ run_xcodebuild() {
     SYMROOT="$BUILD_DIR/Build/Products"
     OBJROOT="$BUILD_DIR/Build/Intermediates"
     PRODUCT_BUNDLE_IDENTIFIER="$BUNDLE_ID"
-    MARKETING_VERSION="$LOVE_VERSION"
+    MARKETING_VERSION="$marketing_version"
+    CURRENT_PROJECT_VERSION="$project_version"
     ONLY_ACTIVE_ARCH=NO
   )
 
@@ -420,12 +600,18 @@ run_xcodebuild() {
     cp "$LOVE_FILE" "$app/game.love"
   fi
 
+  verify_native_bridge "$app"
+
   local dist_dir="$DIST/${config}-${sdk}"
   rm -rf "$dist_dir"
   mkdir -p "$dist_dir"
   cp -R "$app" "$dist_dir/$APP_NAME.app"
   say "copied to $dist_dir/$APP_NAME.app"
 
+  if $DEVICE; then
+    package_ipa "$dist_dir/$APP_NAME.app"
+  fi
+
   say "iOS app: $app"
   say "bundle id: $BUNDLE_ID  display: $DISPLAY_NAME"
   if $DEVICE; then
@@ -439,6 +625,20 @@ run_xcodebuild() {
   fi
 }
 
+# Pack Payload/<app>.app into dist/ios/gen1recomp.ipa for release / sideload tools.
+package_ipa() {
+  local app="$1"
+  local ipa="$DIST/$APP_NAME.ipa"
+  local tmp
+  tmp="$(mktemp -d "$DIST/ipa.XXXXXX")"
+  mkdir -p "$tmp/Payload"
+  cp -R "$app" "$tmp/Payload/$(basename "$app")"
+  rm -f "$ipa"
+  (cd "$tmp" && zip -q -r "$ipa" Payload)
+  rm -rf "$tmp"
+  say "ipa: $ipa ($(du -h "$ipa" | cut -f1))"
+}
+
 # ------------------------------------------------------------ device install
 # Installs the freshly built .app onto the first connected iPhone/iPad via
 # devicectl. The phone must be paired (plugged in at least once + "Trust
@@ -471,8 +671,10 @@ install_to_device() {
 
 # --------------------------------------------------------------- main
 apply_ios_branding
+apply_ios_icon
 say "applying iOS native bridge patches (picker/Files support)"
 python3 "$IOS_DIR/patch_love_src.py" || fail "patch_love_src.py failed"
+ensure_manifests
 pack_game_love
 ensure_game_love_in_xcode
 

scripts/lint.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Static analysis for the engine Lua (config: .luacheckrc).
+#
+# Complements scripts/test.sh: the tests prove behavior, luacheck catches the
+# defects that never run in a green test -- undefined globals/locals (the
+# class that hid a music.volume crash: a hook read a `state` that was still
+# the nil global), unused values, unreachable code. The .luacheckrc mutes the
+# cosmetic categories the codebase lives with, so what prints is worth a look.
+#
+#   scripts/lint.sh            lint src/
+#   scripts/lint.sh src tools  lint specific paths
+#
+# Install once with:  luarocks install luacheck
+
+set -uo pipefail
+cd "$(dirname "$0")/.."
+
+if ! command -v luacheck >/dev/null 2>&1; then
+  echo "luacheck not found on PATH (install: luarocks install luacheck)" >&2
+  exit 2
+fi
+
+luacheck "${@:-src}"

src/battle/BattleState.lua

@@ -645,17 +645,63 @@ function BattleState.newTrainer(game, oppClass, partyIndex)
   return self
 end
 
+-- The disguise itself.  InitWildBattle .isGhost (engine/battle/core.asm)
+-- swaps only the pic and the nick -- wEnemyMonSpecies2 still holds the real
+-- species, so the SGB palette stays the disguised mon's.  ghostReal keeps
+-- what LoadEnemyMonData puts back when the scope unveils.
+local function disguiseAsGhost(self)
+  self.ghostReal = { name = self.enemy.name, sprite = self.enemy.sprite }
+  self.enemy.name = "GHOST"
+  self.enemy.sprite = getImage("assets/generated/battle/front/ghost.png",
+                               monPalette(self.data, self.enemy.mon.species))
+  self.introText = Strings("The GHOST\nappeared!")
+end
+
 -- Pokémon Tower ghosts (engine/battle/core.asm): without the Silph Scope
 -- the enemy is "GHOST", you're too scared to attack, and balls fail.
 function BattleState:makeGhost()
   self.ghost = true
-  self.enemy.name = "GHOST"
-  -- the ghost keeps the disguised mon's SGB palette: InitWildBattle
-  -- swaps only the pic, wEnemyMonSpecies2 still holds the real species
-  -- (engine/battle/core.asm InitWildBattle .isGhost)
-  self.enemy.sprite = getImage("assets/generated/battle/front/ghost.png",
-                               monPalette(self.data, self.enemy.mon.species))
-  self.introText = Strings("The GHOST\nappeared!")
+  disguiseAsGhost(self)
+end
+
+-- The RESTLESS SOUL with the SILPH SCOPE in the bag.  Mechanically this is
+-- not a ghost battle at all -- IsGhostBattle (core.asm) returns false the
+-- moment the scope is in the bag, so the mon attacks, is attacked and rolls
+-- for flight normally -- but InitWildBattle still enters disguised: its
+-- .isGhost branch fires on wCurOpponent == RESTLESS_SOUL as well.  Taking
+-- the disguise off is PrintBeginningBattleText .isMarowak's job
+-- (engine/battle/common_text.asm), which enter() queues through
+-- queueScopeReveal (#492).
+function BattleState:makeUnveiledGhost()
+  self.scopeReveal = true
+  disguiseAsGhost(self)
+end
+
+-- MarowakAnim (engine/battle/ghost_marowak_anim.asm) counted in frames: the
+-- ghost pic is copied into OAM and flashed 8 times by xor-ing rOBP1 with
+-- $80 (10 frames a side), the BG pic underneath is swapped to the RESTLESS
+-- SOUL, rOBP1 is shifted left two bits every 10 frames until the ghost has
+-- faded into the paper (3 shifts), and the Marowak copy fades back in the
+-- same way (4 shifts).  Alpha over the paper is what those OBP shifts look
+-- like on screen.
+BattleState.GHOST_FLASH_FRAMES = 80
+BattleState.GHOST_FADE_OUT_FRAMES = 30
+BattleState.GHOST_FADE_IN_FRAMES = 40
+BattleState.GHOST_REVEAL_FRAMES = 150
+
+-- The rows .isMarowak prints over the disguise, after the "GHOST appeared!"
+-- box enter() has already queued: the unveil line, MarowakAnim, then "Wild
+-- MAROWAK appeared!" under the restored name.  The fall-through into
+-- .playSFX at the end is the same SFX_TRAINER_APPEARED the port does not
+-- play for trainer intros either, so it is left out here too.
+function BattleState:queueScopeReveal()
+  local unveiled = self.data.text and self.data.text._UnveiledGhostText
+  self:say(unveiled
+           or Strings("SILPH SCOPE\nunveiled the\vGHOST's identity!"))
+  self:act(function() self.ghostReveal = { t = 0 } end)
+  table.insert(self.queue, { wait = BattleState.GHOST_REVEAL_FRAMES })
+  self:say(Strings("Wild %s\nappeared!",
+                   self.ghostReal and self.ghostReal.name or self.enemy.name))
 end
 
 -- The old man's catch tutorial (BATTLE_TYPE_OLD_MAN,
@@ -669,6 +715,12 @@ end
 function BattleState:makeOldManDemo(name)
   self.demo = true
   self.demoName = name or "OLD MAN"
+  -- LoadPlayerBackPic and DisplayBattleMenu split on the same wBattleType:
+  -- BATTLE_TYPE_OLD_MAN gets .oldManName + OldManPicBack, BATTLE_TYPE_PIKACHU
+  -- gets .profOakName + ProfOakPicBack (pokeyellow core.asm).  The thrower
+  -- name the caller passes IS that distinction here, so it picks the pic too
+  -- -- data/scripts/story2.lua is the only site that names PROF.OAK (#557).
+  self.oakDemo = name == "PROF.OAK"
   -- Yellow's Pallet intro runs this before the player owns any mon
   -- (BATTLE_TYPE_PIKACHU precedes the lab gift), so newWild flagged the
   -- battle dead for lack of a party.  The demo never sends out, draws, or
@@ -1214,7 +1266,8 @@ function BattleState:enter()
   -- fade, the ground-padding measurement and battle_sprite_scales.
   local backPath, backTrueColor =
     require("src.pokemon.Sprites").playerPath(self.data, "back",
-      { kind = "battle", demo = self.demo, battle = self })
+      { kind = "battle", demo = self.demo, oakDemo = self.oakDemo,
+        battle = self })
   self.playerBackPic = getImage(backPath,
     namedPalette(self.data, "MEWMON"), backTrueColor)
   self.showPlayerBack = self.playerBackPic ~= nil
@@ -1229,11 +1282,16 @@ function BattleState:enter()
   -- battle calls PlayCry BEFORE PrintText WildMonAppearedText, so the cry
   -- sounds with the "Wild X appeared!" box instead of waiting on the A
   -- press that clears its `prompt` (#303).  The Silph-Scope-less tower
-  -- ghost gets no cry at all (common_text.asm:43-48).
-  if self.kind ~= "trainer" and self.kind ~= "link" and not self.ghost then
+  -- ghost gets no cry at all (common_text.asm:43-48), and neither does the
+  -- unveiled MAROWAK: .isMarowak never reaches PlayCry (#492).
+  if self.kind ~= "trainer" and self.kind ~= "link"
+     and not self.ghost and not self.scopeReveal then
     queueEnemyCry()
   end
   self:say(self.introText)
+  -- the unveil rides on that same box, before _InitBattleCommon clears the
+  -- intro chrome below (#492)
+  if self.scopeReveal then self:queueScopeReveal() end
   -- _InitBattleCommon (core.asm:6755-6762): the instant the intro text is
   -- dismissed both HUD blocks are cleared and ClearSprites drops the
   -- pokeball OAM, so the intro chrome never returns for the rest of the
@@ -1507,10 +1565,14 @@ function BattleState:update(dt)
     end
     local col = (self.menuIndex - 1) % 2
     local row = math.floor((self.menuIndex - 1) / 2)
-    if input:wasPressed("left") or input:wasPressed("right") then
-      col = 1 - col
-    elseif input:wasPressed("up") or input:wasPressed("down") then
-      row = 1 - row
+    if input:wasPressed("left") then
+      col = math.max(0, col - 1)
+    elseif input:wasPressed("right") then
+      col = math.min(1, col + 1)
+    elseif input:wasPressed("up") then
+      row = math.max(0, row - 1)
+    elseif input:wasPressed("down") then
+      row = math.min(1, row + 1)
     end
     self.menuIndex = row * 2 + col + 1
     if input:wasPressed("a") then
@@ -1539,10 +1601,14 @@ function BattleState:update(dt)
     end
     local col = (self.menuIndex - 1) % 2
     local row = math.floor((self.menuIndex - 1) / 2)
-    if input:wasPressed("left") or input:wasPressed("right") then
-      col = 1 - col
-    elseif input:wasPressed("up") or input:wasPressed("down") then
-      row = 1 - row
+    if input:wasPressed("left") then
+      col = math.max(0, col - 1)
+    elseif input:wasPressed("right") then
+      col = math.min(1, col + 1)
+    elseif input:wasPressed("up") then
+      row = math.max(0, row - 1)
+    elseif input:wasPressed("down") then
+      row = math.min(1, row + 1)
     end
     self.menuIndex = row * 2 + col + 1
     if input:wasPressed("a") then
@@ -2655,6 +2721,35 @@ function BattleState:updateFx()
       end
     end
   end
+  -- The Silph Scope unveil (MarowakAnim; queueScopeReveal parks a wait row
+  -- of GHOST_REVEAL_FRAMES over it): the ghost flashes, fades out, the pic
+  -- and the nick swap back the way LoadEnemyMonData restores them, and the
+  -- real mon fades in (#492).
+  local gr = self.ghostReveal
+  if gr and self.enemy then
+    gr.t = gr.t + 1
+    local pf = self:picFxFor(self.enemy)
+    local flashEnd = BattleState.GHOST_FLASH_FRAMES
+    local outEnd = flashEnd + BattleState.GHOST_FADE_OUT_FRAMES
+    if gr.t <= flashEnd then
+      pf.fade = (math.floor((gr.t - 1) / 10) % 2 == 1) and 0.5 or 1
+    elseif gr.t <= outEnd then
+      pf.fade = 1 - math.ceil((gr.t - flashEnd) / 10) / 3
+    else
+      if not gr.swapped then
+        gr.swapped = true
+        local real = self.ghostReal
+        if real then
+          self.enemy.name = real.name or self.enemy.name
+          self.enemy.sprite = real.sprite or self.enemy.sprite
+        end
+      end
+      pf.fade = math.min(1, math.ceil((gr.t - outEnd) / 10) / 4)
+    end
+    if gr.t >= BattleState.GHOST_REVEAL_FRAMES then
+      self.ghostReveal, self.scopeReveal, pf.fade = nil, nil, nil
+    end
+  end
   -- the send-out grow-in (AnimateSendingOutMon): 3+4+5 frames, then
   -- the pic draws at full size again
   if self.growIn then
@@ -2669,10 +2764,24 @@ function BattleState:updateFx()
   -- so a sounding siren rides out the next hit's HP drain instead of
   -- dropping out mid-announcement (#293)
   self.lowHealthAlarmOn = self:lowHealthAlarmActive()
-  if self.lowHealthAlarmOn then
-    Sound.startLoop(self.data, "Low_Health_Alarm")
+  -- battle.low_health_alarm: on/off toggle for the siren loop, ctx.on
+  -- mirrors self.lowHealthAlarmOn. Vanilla just starts/stops the loop
+  -- each frame; a mod can wrap this to reshape the toggle (e.g. force
+  -- ctx.on false after some budget) before letting vanilla act on it.
+  if Runtime.wantsHook("battle.low_health_alarm") then
+    Runtime.call("battle.low_health_alarm", function(ctx)
+      if ctx.on then
+        Sound.startLoop(ctx.battle.data, "Low_Health_Alarm")
+      else
+        Sound.stopLoop("Low_Health_Alarm")
+      end
+    end, { on = self.lowHealthAlarmOn, battle = self })
   else
-    Sound.stopLoop("Low_Health_Alarm")
+    if self.lowHealthAlarmOn then
+      Sound.startLoop(self.data, "Low_Health_Alarm")
+    else
+      Sound.stopLoop("Low_Health_Alarm")
+    end
   end
 end
 
@@ -3208,7 +3317,10 @@ function BattleState:onFaint(battler)
   end
 end
 
-function BattleState:enemyMonFainted()
+-- Exp for the defeated enemy, shared by the faint path (enemyMonFainted)
+-- and, when a mod's battle.catch_exp hook says so, the catch path
+-- (storeCaughtMon).
+function BattleState:awardExp()
   -- exp is split among the mons that fought this enemy
   -- (engine/battle/experience.asm); traded mons earn x1.5; each
   -- participant gets the full stat exp
@@ -3286,27 +3398,44 @@ function BattleState:enemyMonFainted()
       end
     end
   end
-  -- with EXP.ALL, participants split half the exp and the other half
-  -- is divided among the whole party (engine/battle/experience.asm)
-  local expAll = (self.game.save.inventory.EXP_ALL or 0) > 0
-  for _, mon in ipairs(alive) do
-    applyShare(mon, participants * (expAll and 2 or 1), true)
-  end
-  if expAll then
-    -- the second GainExperience pass sets the gain flags for the WHOLE
-    -- party, so DivideExpDataByNumMonsGainingExp divides the already
-    -- halved-and-participant-divided exp again by the party count, and
-    -- .partyMonLoop still skips fainted mons (core.asm:818-858 +
-    -- experience.asm:9-13); each mon gets its own GainedText with the
-    -- "with EXP.ALL," tail (wBoostExpByExpAll) -- pokered prints no
-    -- summary line
-    for _, mon in ipairs(self.game.save.party) do
-      if mon.hp > 0 then
-        applyShare(mon, math.max(1, participants) * #self.game.save.party * 2, "expAll")
+  -- battle.exp_award: the participant/EXP.ALL split, factored out so a
+  -- mod can replace it wholesale (e.g. a flat undivided share to every
+  -- non-fainted party mon) without re-deriving participants/alive.
+  -- ctx.applyShare(mon, split, announce) is the same helper vanilla uses.
+  local function vanillaExpAward(ctx)
+    -- with EXP.ALL, participants split half the exp and the other half
+    -- is divided among the whole party (engine/battle/experience.asm)
+    local expAll = (self.game.save.inventory.EXP_ALL or 0) > 0
+    for _, mon in ipairs(ctx.alive) do
+      ctx.applyShare(mon, ctx.participants * (expAll and 2 or 1), true)
+    end
+    if expAll then
+      -- the second GainExperience pass sets the gain flags for the WHOLE
+      -- party, so DivideExpDataByNumMonsGainingExp divides the already
+      -- halved-and-participant-divided exp again by the party count, and
+      -- .partyMonLoop still skips fainted mons (core.asm:818-858 +
+      -- experience.asm:9-13); each mon gets its own GainedText with the
+      -- "with EXP.ALL," tail (wBoostExpByExpAll) -- pokered prints no
+      -- summary line
+      for _, mon in ipairs(self.game.save.party) do
+        if mon.hp > 0 then
+          ctx.applyShare(mon, math.max(1, ctx.participants) * #self.game.save.party * 2, "expAll")
+        end
       end
     end
   end
+  local awardCtx = { battle = self, participants = participants, alive = alive,
+                      applyShare = applyShare }
+  if Runtime.wantsHook("battle.exp_award") then
+    Runtime.call("battle.exp_award", vanillaExpAward, awardCtx)
+  else
+    vanillaExpAward(awardCtx)
+  end
   self.participants = {}
+end
+
+function BattleState:enemyMonFainted()
+  self:awardExp()
 
   if self.kind == "trainer" then
     -- EnemySendOutFirstMon / AnyEnemyPokemonAliveCheck (core.asm): scan
@@ -3345,10 +3474,12 @@ function BattleState:enemyMonFainted()
       -- SwitchPlayerMon runs AFTER TrainerSentOutText (core.asm:1436-1443)
       local shiftSwitchMon = nil
       if style ~= "set" and partyCount > 1 and self.player.mon.hp > 0 then
-        -- _TrainerAboutToUseText: "X is" / "about to use" then cont nick,
-        -- then para "Will PLAYER" / "change POKéMON?" with YES/NO.
-        self:say(Strings("%s is\nabout to use", self.trainer.name))
-        self:say(Strings("%s!", nextName))
+        -- _TrainerAboutToUseText (data/text/text_2.asm): "X is" / "about to
+        -- use" then a CONT to the nick, not a fresh box -- the box scrolls
+        -- "X is" off so "about to use" stays above the name, instead of the
+        -- page ending on a bare nick (#565).  Then para "Will PLAYER" /
+        -- "change POKéMON?" with YES/NO.
+        self:say(Strings("%s is\nabout to use\v%s!", self.trainer.name, nextName))
         self:sayChoice(
           Strings("Will %s\nchange POKéMON?", self.game.save.player.name),
           function(yes)
@@ -3466,8 +3597,18 @@ function BattleState:enemyMonFainted()
       -- PrintEndBattleText prints one text box; a `para` (\f) inside it
       -- starts a fresh page, which is a message row of its own here (five
       -- EndBattleTexts carry one, e.g. _Route9Youngster1EndBattleText)
+      -- TrainerEndBattleText (home/trainers.asm) prints _TrainerNameText
+      -- (wNameBuffer then ": ", data/text/text_1.asm) and only then the
+      -- saved pointer, so the loss line opens with the trainer class tag on
+      -- its first line (RIVAL1/2/3 tag with the rival's name:
+      -- TrainerNamePointers aims those entries at wTrainerName).  The tag
+      -- prints once, so a `para` page carries no second copy (#566).
+      local tag = self.trainer and self.trainer.name
       for page in (self.endBattleText .. "\f"):gmatch("(.-)\f") do
-        if page ~= "" then self:sayNext(page) end
+        if page ~= "" then
+          self:sayNext(tag and (tag .. ": " .. page) or page)
+          tag = nil
+        end
       end
     end
     self:sayNext(Strings("%s got ¥%d\nfor winning!", self.game.save.player.name, prize))
@@ -3867,6 +4008,12 @@ function BattleState:storeCaughtMon()
   -- (item_effects.asm:472-501), regenerating its move list from the
   -- base data -- a Mimic'd slot never leaves the battle with it
   self:restoreMimicked(self.enemy)
+  -- battle.catch_exp: vanilla catches never grant exp; a mod can flip
+  -- this to true to pay out the same award a faint would have.
+  if Runtime.wantsHook("battle.catch_exp")
+     and Runtime.call("battle.catch_exp", function() return false end, { battle = self }) then
+    self:awardExp()
+  end
   local game = self.game
   local dex = game.save.pokedex
   local species = self.enemy.mon.species
@@ -4296,6 +4443,18 @@ function BattleState:drawBattlerPic(battler, x, y, scale)
   end
   if battler.fainted then return end
 
+  -- MarowakAnim's rOBP1 fades (updateFx): alpha over the paper is what those
+  -- palette shifts look like, and the test has to sit ahead of the plain
+  -- fast path below (#492)
+  local fadePf = self.picFx and self.picFx[battler]
+  if fadePf and fadePf.fade then
+    local cr, cg, cb, ca = love.graphics.getColor()
+    love.graphics.setColor(cr, cg, cb, ca * fadePf.fade)
+    love.graphics.draw(img, x, y, 0, scale, scale)
+    love.graphics.setColor(cr, cg, cb, ca)
+    return
+  end
+
   local pf = self.picFx and self.picFx[battler]
   if not pf or (not pf.kind and not pf.hidden and not pf.minimized
                 and (pf.ox or 0) == 0 and (pf.oy or 0) == 0) then
@@ -4483,7 +4642,9 @@ function BattleState:sgbBattlePals()
   -- true white, which is what drew a white box around each pic on the pink
   -- field.  Snap every zone's color 0/3 to the global GBC white/black; the
   -- mid shades (and the green bar the user prefers) stay untouched.
-  if PaletteFX.mode == "ogred" then
+  -- Boot-ROM OG only (Red/Blue): snap zone paper to the global GBC white/black.
+  -- OG YELLOW keeps each CGBBasePalettes endpoint (already near-white / near-black).
+  if PaletteFX.mode == "ogred" and not require("src.core.GameVersion").isYellow() then
     local white, black = PaletteFX.GBC_BG[1], PaletteFX.GBC_BG[4]
     for i = 0, 3 do
       local c = out[i]

src/battle/EffectRegistry.lua

@@ -93,6 +93,12 @@ function EffectRegistry.runDamaging(battle, ctx, record)
     -- Explosion/Selfdestruct still animate on a miss (HandleIfPlayerMoveMissed)
     if not (record and record.explode) then battle:cancelMoveAnim() end
     battle:sayNext(Strings("%s's\nattack missed!", displayName(user)))
+    -- MoveHitTest's INVULNERABLE branch sets the same wMoveMissed as a
+    -- failed accuracy roll (core.asm:5260), and the miss handler still
+    -- runs the explode effect ("even if Explosion or Selfdestruct
+    -- missed, its effect still needs to be activated", core.asm:3223),
+    -- so the user faints against a mid-Fly/Dig target too (#528)
+    if record and record.onMiss then record.onMiss(ctx, "invulnerable") end
     return
   end
 

src/battle/WideBattle.lua

@@ -183,6 +183,21 @@ local function drawCommandMenu(battle)
   Font.drawBox(0, 13, 20, 5)
   Font.drawBox(20, 13, 18, 5)
   love.graphics.setColor(0, 0, 0, 1)
+  -- The old-man / PROF.OAK catch demo has no party, so makeOldManDemo parks
+  -- the WILD mon in battle.player as a placeholder (BattleState:1209).  The
+  -- classic layout's demo branch never names anyone (DisplayBattleMenu,
+  -- core.asm:2038-2049, just draws the menu), so naming it here printed
+  -- "What will PIKACHU do?" over Oak's scripted throw (#557).  Leave the
+  -- prompt side blank and run the same scripted hand the classic does.
+  if battle.demo then
+    Font.draw(Strings("FIGHT"), 176, 112)
+    Font.drawCode(0xE1, 240, 112); Font.drawCode(0xE2, 248, 112)
+    Font.draw(Strings("ITEM"), 176, 128)
+    Font.draw(Strings("RUN"), 240, 128)
+    -- next to FIGHT for the first 80 frames, then ITEM
+    Font.drawCode(0xED, 168, (battle.demoTimer or 0) <= 80 and 112 or 128)
+    return
+  end
   Font.draw(Strings("What will"), 8, 112)
   local who = battle.player and battle.player.name or ""
   Font.draw(fitName(who, 112) .. Strings(" do?"), 8, 128)
@@ -310,17 +325,35 @@ function WideBattle.draw(battle)
   -- Each side keeps its original sprite pixels and placement math: the two
   -- 160x144 OAM regions are translated apart and clipped into the wider
   -- battlefield rather than either monster being scaled.  wideRegion tells
-  -- drawBattlerPic its own side window is already the clip.
+  -- drawBattlerPic its own side window is already the clip.  A shake moves
+  -- each region's clip with its contents, so a pic pushed toward a region
+  -- edge is not sheared off it (a vertical shake used to clip the player's
+  -- feet at FIELD_BOTTOM).
   battle.wideRegion = true
-  inRegion(0, 32, 160, WideBattle.FIELD_BOTTOM - 32, 20 + sx, 8 + sy,
+  inRegion(sx, 32 + sy, 160, WideBattle.FIELD_BOTTOM - 32, 20 + sx, 8 + sy,
     function() battle:drawPicsLayer(slide, 0, 0, "player", true) end)
-  inRegion(160, 0, 144, WideBattle.FIELD_BOTTOM, 136 + sx, sy,
+  inRegion(160 + sx, sy, 144, WideBattle.FIELD_BOTTOM, 136 + sx, sy,
     function() battle:drawPicsLayer(slide, 0, 0, "enemy", true) end)
   battle.wideRegion = nil
 
-  drawHUDs(battle, slide)
+  -- A battle sets rWY to 0 (engine/battle/core.asm), so the window the
+  -- shakes move IS the whole screen: PredefShakeScreenHorizontally,
+  -- PredefShakeScreenVertically and AnimationShakeScreenHorizontallySlow
+  -- displace the HUDs and the message window along with the pics, exactly as
+  -- drawClassic offsets its whole BG canvas.  Shaking only the two pic
+  -- regions left the foe gliding sideways across a nailed-down screen on
+  -- every applying-attack shake -- TAIL WHIP and every other status move
+  -- (#562).  The OAM anim layer stays put, as it does in drawClassic.
+  local function shaken(fn)
+    if sx == 0 and sy == 0 then return fn() end
+    g.push()
+    g.translate(sx, sy)
+    fn()
+    g.pop()
+  end
+  shaken(function() drawHUDs(battle, slide) end)
   drawAnimationLayer(battle)
-  drawTextArea(battle)
+  shaken(function() drawTextArea(battle) end)
 
   if fx and fx.flash and fx.flash > 0 and battle.frame % 4 < 2 then
     g.setColor(1, 1, 1, 0.85)

src/core/Data.lua

@@ -14,12 +14,12 @@ local MODULES = {
 -- Optional for compatibility with developer and stale caches.
 local OPTIONAL = { "audio", "palettes", "icons" }
 
--- The rules the engine still carries as literals.  The constants registry
--- deep-merges over these, so a value has to exist before a mod can patch
--- it; each one is the number the engine hard-codes today, so seeding them
--- changes nothing on a mod-free boot.
+-- Vanilla defaults for rules exposed through the constants registry.  A
+-- value has to exist before a mod can patch it; each one matches the
+-- engine's no-mod behavior, so seeding them changes nothing on a vanilla
+-- boot.
 local CONSTANT_DEFAULTS = {
-  bagSize = 20,                 -- BAG_ITEM_CAPACITY (src/inventory/Bag.lua)
+  bagSize = 20,                 -- BAG_ITEM_CAPACITY (Bag.capacity fallback)
   partyMax = 6,                 -- PARTY_LENGTH (src/pokemon/Party.lua)
   boxCount = 12, boxSize = 20,  -- Bill's PC (src/pokemon/Boxes.lua)
   moveMax = 4,
@@ -144,8 +144,8 @@ end
 -- no def_trainers row (DisplayTextID routes to his ASM script), so the
 -- extractor emits headers only for the four blackbelts ([2]..[5]).  Seed
 -- object index [1] so he behaves like the real leader:
---   * range 4 (matches the strongest blackbelt) -> CheckFightingMapTrainers
---     spots the player in his DOWN line and he challenges on sight (#197),
+--   * range 0: FightingDojoDefaultScript, not trainer sight, starts his
+--     battle from the single tile to his left (#495),
 --   * battle = his pre-battle challenge, won = "Hwa! Arrgh! Beaten!",
 --   * after = the "Stay and train at Karate with us!" re-talk line.
 -- Deliberately NO `event`: EVENT_BEAT_KARATE_MASTER is owned by
@@ -160,7 +160,7 @@ function Data:seedFightingDojoKarateMaster()
   headers.FightingDojo = headers.FightingDojo or {}
   if headers.FightingDojo[1] then return end
   headers.FightingDojo[1] = {
-    range = 4,
+    range = 0,
     battle = "_FightingDojoKarateMasterText",
     won = "_FightingDojoKarateMasterDefeatedText",
     after = "_FightingDojoKarateMasterStayAndTrainWithUsText",

src/core/Game.lua

@@ -172,7 +172,28 @@ function Game:returnToTitle()
 end
 
 function Game:step(dt)
+  -- Tool mods (autoplay, accessibility drivers, input visualizers) act on
+  -- the same fixed-step boundary as a physical controller.  Run them before
+  -- Input:step promotes queued edges so a button chosen here is visible to
+  -- this logic tick, not one tick later.  With no wrapper this is a no-op.
+  ModRuntime.call("input.step", function() end, self, dt)
   self.input:step()
+  -- A+B+SELECT+START held for 16 steps: SoftReset (home/init.asm) stops the
+  -- audio, whites the palettes out and falls through into Init, i.e. the
+  -- power-on boot, so everything unsaved is gone and the title sequence
+  -- comes back -- exactly what returnToTitle does for the START menu's QUIT.
+  -- The check lives here, above stack:update, so it fires from any state:
+  -- overworld, battle, a menu or a cutscene, the way _Joypad's does (#563).
+  -- Input:reset clears the four still-physically-held buttons so the title
+  -- screen does not read A as a menu choice on its first frame.
+  -- a tool mod (or a harness) may hand Game a stand-in input with no
+  -- chord bookkeeping; those simply never soft reset
+  if self.input.softResetStep and self.input:softResetStep() then
+    Input:reset()
+    TouchControls:reset()
+    self:returnToTitle()
+    return
+  end
   -- serviced unconditionally: a link battle's ENet transport must not
   -- stall just because PartyMenu/ChoiceBox/NamingScreen is temporarily
   -- on top of BattleState (see LinkBattle.new)
@@ -339,7 +360,13 @@ function Game:draw()
   if worldBelow and self.overworld.sgbWorldZones then
     worldZones = self.overworld:sgbWorldZones()
   end
-  Renderer:endFrame(zones, worldZones)
+  local viewport = Renderer:endFrame(zones, worldZones)
+  -- Persistent tool status is screen-space UI: draw it over the completed
+  -- render pipeline with exact playfield/margin geometry, but below mobile
+  -- controls. It never becomes an updating game state.
+  if ModRuntime.wantsHook("render.hud") then
+    ModRuntime.call("render.hud", function() end, self, viewport)
+  end
   -- on-screen mobile controls: pure screen-space, over the finished frame
   TouchControls:draw()
 end
@@ -491,21 +518,36 @@ function Game:gamepadaxis(joystick, axis, value)
   Input:gamepadaxis(joystick, axis, value)
 end
 
+-- conf.lua turns the mobile accelerometer-joystick off (#468), but guard the
+-- generic joystick path anyway: any sensor-style device that still reaches us
+-- has gravity pinning an axis past the deadzone, which would hide the touch
+-- overlay every instant and steer the player by tilt through the axis-1/2
+-- mapping (#459).  Real controllers arrive as SDL gamepads or named sticks,
+-- never as "* Accelerometer".
+local function isAccelerometer(joystick)
+  local name = joystick and joystick.getName and joystick:getName()
+  return name ~= nil and name:lower():find("accelerometer", 1, true) ~= nil
+end
+
 function Game:joystickpressed(joystick, button)
+  if isAccelerometer(joystick) then return end
   TouchControls:noteGamepad()
   Input:joystickpressed(joystick, button)
 end
 
 function Game:joystickreleased(joystick, button)
+  if isAccelerometer(joystick) then return end
   Input:joystickreleased(joystick, button)
 end
 
 function Game:joystickaxis(joystick, axis, value)
+  if isAccelerometer(joystick) then return end
   if math.abs(value) > 0.5 then TouchControls:noteGamepad() end
   Input:joystickaxis(joystick, axis, value)
 end
 
 function Game:joystickhat(joystick, hat, direction)
+  if isAccelerometer(joystick) then return end
   if direction ~= "c" then TouchControls:noteGamepad() end
   Input:joystickhat(joystick, hat, direction)
 end
@@ -563,6 +605,11 @@ end
 -- Capture the live world state into the save table and persist it.
 -- Options are flushed to options.lua as part of SaveData.save.
 function Game:writeSave()
+  -- Tool sessions can be deliberately ephemeral. Give them one narrow veto
+  -- before captureSave mutates the snapshot or any progress bytes reach disk.
+  if ModRuntime.call("save.write", function() return true end, self) == false then
+    return false
+  end
   if self.overworld and self.overworld.captureSave then
     self.overworld:captureSave(self.save)
   end
@@ -573,7 +620,7 @@ function Game:writeSave()
   if ModRuntime.wants("save.writing") then
     ModRuntime.emit("save.writing", { save = self.save, meta = self.save.meta })
   end
-  SaveData.save(self.save)
+  return SaveData.save(self.save)
 end
 
 -- Persist options.lua only (Options menu / hotkeys 2-5).  Keeps settings
@@ -603,7 +650,25 @@ function Game:applyOptions(opts)
   -- normalizes a nil/garbage cap to the 60 default, so old saves with no
   -- fpsCap key pace at the standard rate (issue #88)
   require("src.core.FrameCap").applyOptions(opts)
+  -- Scale the optional presentation extras to the device's performance
+  -- tier.  Every heavy feature was just applied from the stored options
+  -- above; here we clamp the *live* state down for a weaker device without
+  -- rewriting what the player saved, so raising the tier later restores
+  -- their exact TILT / GBC FX / ZOOM / MAX FPS choices.  A HIGH tier (the
+  -- default on a normal desktop, and every options.lua predating this
+  -- option) clamps nothing, so it is a no-op for the common case.
+  local caps = require("src.core.Performance").applyOptions(opts)
+  if not caps.tilt then require("src.render.Tilt").setLevel(0) end
+  if not caps.gbcfx then require("src.render.GBCFX").setLevel(0) end
+  local Zoom = require("src.render.Zoom")
+  Zoom.allowSurvey = caps.survey
+  if not caps.survey and Zoom.offset < 0 then Zoom.offset = 0 end
+  if caps.fpsMax then
+    local FrameCap = require("src.core.FrameCap")
+    if FrameCap.current > caps.fpsMax then FrameCap.apply(caps.fpsMax) end
+  end
   Input:applyBindings(opts.bindings)
+  TouchControls:applyOptions(opts)
   -- heal soft-bricked APK installs that already saved gbcfx > 0 (#136)
   if gbcCleared then self:writeOptions() end
 end

src/core/Input.lua

@@ -263,8 +263,56 @@ function Input:isDown(btn)
   return self.state[btn] or false
 end
 
+-- True when the on-screen overlay is one of the live sources holding this
+-- button (see overlayPressed above).  Player:turnWindow widens the
+-- turn-in-place tap window on touch, where a press and release can never be
+-- as short as a physical d-pad's (#415).
+function Input:isTouchDown(btn)
+  local sources = self.sources[btn]
+  return (sources and sources["touch:" .. btn]) and true or false
+end
+
 function Input:wasPressed(btn)
   return self.pressed[btn] or false
 end
 
+-- Soft reset (#563).  _Joypad (engine/joypad.asm) tests the RAW joypad read
+-- with `cp PAD_BUTTONS` -- an equality, not a mask -- so the combo counts
+-- only while A, B, SELECT and START are the only buttons down; any d-pad
+-- direction in the mix cancels it.  That test sits ahead of the wJoyIgnore
+-- and BIT_DISABLE_JOYPAD masking below it, which is why the reset still
+-- works mid-battle and mid-cutscene where ordinary input is thrown away.
+-- TrySoftReset then burns one DelayFrame per pass and decrements hSoftReset,
+-- seeded with 16 by Init (home/init.asm), so the combo has to survive 16
+-- consecutive polls.  That hold is also what keeps the on-screen overlay
+-- safe: it already takes four separate fingers on four separate controls,
+-- and they all have to stay put for better than a quarter of a second.
+local SOFT_RESET_FRAMES = 16
+
+function Input:softResetHeld()
+  if not (self.state.a and self.state.b
+          and self.state.start and self.state.select) then
+    return false
+  end
+  return not (self.state.up or self.state.down
+              or self.state.left or self.state.right)
+end
+
+-- Ticked once per fixed step by Game:step; true on the step the countdown
+-- runs out.  hSoftReset is never re-seeded on release in the original, so
+-- its count leaks across a whole session; a port that copied that would
+-- eventually reset on a stray four-button press, so the counter re-arms as
+-- soon as the combo drops.
+function Input:softResetStep()
+  if not self:softResetHeld() then
+    self.softResetFrames = nil
+    return false
+  end
+  local left = (self.softResetFrames or SOFT_RESET_FRAMES) - 1
+  self.softResetFrames = left
+  if left > 0 then return false end
+  self.softResetFrames = nil
+  return true
+end
+
 return Input

src/core/Music.lua

@@ -23,6 +23,13 @@ local volumeScale = 1
 local FILTER_HIGHGAIN = { 0.4, 0.16, 0.064 }
 local filterLevel = 0
 
+-- Forward-declared here so applyVolume (below) closes over the real playback
+-- state rather than a nil global: the table literal is assigned further down,
+-- but a `local state = {}` there would leave every reference above it bound
+-- to the global `state`.  Before this, registering the `music.volume` mod
+-- hook crashed applyVolume on `state.current` (a nil index).
+local state
+
 local function applyVolume(src)
   if not src then return end
   local vol = VOLUME * volumeScale
@@ -63,7 +70,7 @@ local function applyFilter(src)
   end
 end
 
-local state = {
+state = {
   current = nil,      -- song label
   chip = false,       -- the playing song is a synthesized channel program
   source = nil,       -- currently playing source

src/core/Performance.lua

@@ -0,0 +1,156 @@
+-- Graphics performance tier: one knob that scales the port's optional,
+-- non-faithful presentation extras down for weaker hardware.
+--
+-- The heavy extras are all things the Game Boy never had and this port
+-- adds on top: the whole-screen 3D TILT (transforms the entire map as a
+-- ground plane), the GBC FX post-process shader (a fullscreen pass), and
+-- survey ZOOM (zooming out renders the connected neighbor maps -- a lot of
+-- extra overdraw).  A hard FPS ceiling caps present cost on top of that.
+-- None of this touches game logic, which is fixed-step off dt
+-- (src/core/FixedStep.lua), so every tier plays identically; they differ
+-- only in how much optional eye-candy the renderer is allowed to do.
+--
+-- The tier is persisted as save.options.performance:
+--   auto      pick a default from the device (see detect())
+--   high      everything on -- the historical behavior
+--   balanced  no TILT, no GBC FX (kept: survey zoom, colors, uncapped FPS)
+--   low       no TILT, no GBC FX, no survey zoom, FPS capped
+--
+-- AUTO only chooses the *default* for the current device; every tier is
+-- selectable in OPTIONS, so a heuristic that guesses wrong is one row away
+-- from being overridden.  The clamps are applied live in Game:applyOptions
+-- against the stored options without rewriting them, so raising the tier
+-- restores exactly the TILT / GBC FX / ZOOM / FPS the player had.
+--
+-- Zero requires: loads during love.conf and under plain Lua for tools and
+-- tests, the same way src/core/GameVersion.lua does.
+
+local Performance = {}
+
+-- Option-row order (auto first, then most to least capable).
+Performance.TIERS = { "auto", "high", "balanced", "low" }
+
+Performance.LABELS = {
+  auto = "AUTO",
+  high = "HIGH",
+  balanced = "BALANCED",
+  low = "LOW",
+}
+
+-- What each concrete tier permits.  `auto` is resolved to one of these
+-- before caps are read, so it has no row here.  fpsMax = false means no
+-- extra ceiling (the player's own MAX FPS still applies).
+Performance.CAPS = {
+  high     = { tilt = true,  gbcfx = true,  survey = true,  fpsMax = false },
+  balanced = { tilt = false, gbcfx = false, survey = true,  fpsMax = false },
+  low      = { tilt = false, gbcfx = false, survey = false, fpsMax = 60 },
+}
+
+-- Live resolved tier (never "auto"); Game:applyOptions sets it and the
+-- renderer / options row read it back.  Defaults to the unclamped tier so
+-- a pre-boot launcher behaves exactly as it always did.
+Performance.tier = "high"
+
+local function loveOS()
+  if love and love.system and love.system.getOS then
+    return love.system.getOS()
+  end
+  return nil
+end
+
+local function processorCount()
+  if love and love.system and love.system.getProcessorCount then
+    return love.system.getProcessorCount()
+  end
+  return nil
+end
+
+-- CPU architecture via LuaJIT's jit.arch when present: "arm"/"arm64" on
+-- phones and PortMaster handhelds, "x86"/"x64" on desktops.  nil under a
+-- plain-Lua tool or test with no jit table, which resolves to HIGH (no
+-- clamping) so tooling is never surprised.
+local function cpuArch()
+  return (jit and jit.arch) or nil
+end
+
+-- Default tier for the current device.  Deliberately conservative: only
+-- the platforms that are reliably weak drop below HIGH, and AUTO is always
+-- overridable, so a wrong guess costs one OPTIONS row.  A normal
+-- multi-core desktop -- the common case, and every existing install whose
+-- options.lua predates this option -- resolves to HIGH and behaves exactly
+-- as before.
+function Performance.detect()
+  local os = loveOS()
+  local arch = cpuArch()
+  local isArm = arch == "arm" or arch == "arm64"
+  local cores = processorCount()
+
+  -- PortMaster-style ARM Linux handhelds (e.g. the RG34XXSP the project
+  -- already ships a build for): the weakest target here.
+  if isArm and os ~= "Android" and os ~= "iOS" then
+    return "low"
+  end
+  -- Phones and tablets: GBC FX is already force-disabled here (issue #136);
+  -- balanced additionally drops the 3D tilt, the heaviest remaining extra.
+  if os == "Android" or os == "iOS" then
+    return "balanced"
+  end
+  -- Desktop: a dual-core (or single-core) box is the low-end line.
+  if cores and cores <= 2 then
+    return "balanced"
+  end
+  return "high"
+end
+
+-- Fold a stored option value to a concrete tier, resolving "auto" (and any
+-- hand-edited garbage) through detect().
+function Performance.resolve(value)
+  if value == "high" or value == "balanced" or value == "low" then
+    return value
+  end
+  return Performance.detect()
+end
+
+-- Normalize a stored value to a valid option id (keeps "auto"); a bad value
+-- degrades to auto so a corrupt options.lua still lands on something sane.
+function Performance.normalize(value)
+  for _, id in ipairs(Performance.TIERS) do
+    if value == id then return id end
+  end
+  return "auto"
+end
+
+-- Row label for a stored value: the tier's own name (AUTO / HIGH / ...).
+function Performance.label(value)
+  return Performance.LABELS[Performance.normalize(value)]
+end
+
+-- Concrete caps for a stored option value (resolving auto).
+function Performance.caps(value)
+  return Performance.CAPS[Performance.resolve(value)]
+end
+
+-- Resolve the tier for these options, record it live, and return its caps.
+-- Called from Game:applyOptions, which clamps the live presentation modules
+-- against the returned caps.
+function Performance.applyOptions(opts)
+  local tier = Performance.resolve(opts and opts.performance)
+  Performance.tier = tier
+  return Performance.CAPS[tier]
+end
+
+-- Cycle the OPTIONS row: auto -> high -> balanced -> low -> auto (dir -1
+-- reverses).  Lua's `%` is non-negative for a positive modulus, so a
+-- negative dir wraps correctly.
+function Performance.cycle(value, dir)
+  value = Performance.normalize(value)
+  local i = 1
+  for idx, id in ipairs(Performance.TIERS) do
+    if id == value then i = idx break end
+  end
+  local n = #Performance.TIERS
+  local nextIdx = (i - 1 + (dir or 1)) % n + 1
+  return Performance.TIERS[nextIdx]
+end
+
+return Performance

src/core/SafeArea.lua

@@ -0,0 +1,40 @@
+-- Usable window rect for mobile chrome (notch / Dynamic Island / home
+-- indicator / Android display cutouts).  Wraps love.window.getSafeArea when
+-- the engine provides it; otherwise the full graphics window.
+--
+-- Desktop and headless stubs return the full window, so callers can always
+-- layout against this rect without platform branches.  Interactive chrome
+-- (touch overlay, launcher) should prefer this over getDimensions; the game
+-- canvas may still letterbox into the full framebuffer for immersion.
+
+local SafeArea = {}
+
+function SafeArea.rect()
+  local ww, wh = 0, 0
+  if love and love.graphics and love.graphics.getDimensions then
+    ww, wh = love.graphics.getDimensions()
+  end
+  if ww <= 0 then ww = 1 end
+  if wh <= 0 then wh = 1 end
+
+  if not (love and love.window and love.window.getSafeArea) then
+    return 0, 0, ww, wh
+  end
+
+  local x, y, w, h = love.window.getSafeArea()
+  if type(x) ~= "number" or type(y) ~= "number"
+     or type(w) ~= "number" or type(h) ~= "number"
+     or w <= 0 or h <= 0 then
+    return 0, 0, ww, wh
+  end
+
+  -- Clamp to the drawable window so a bad / mid-rotation backend cannot
+  -- push layout outside the surface.
+  x = math.max(0, math.min(x, ww))
+  y = math.max(0, math.min(y, wh))
+  w = math.max(1, math.min(w, ww - x))
+  h = math.max(1, math.min(h, wh - y))
+  return x, y, w, h
+end
+
+return SafeArea

src/core/SaveData.lua

@@ -241,6 +241,11 @@ function SaveData.defaultOptions()
     videoMode = "windowed",
     -- hard render frame-rate cap; render-only pacing (issue #88, FrameCap.lua)
     fpsCap = 60,
+    -- graphics performance tier: auto | high | balanced | low.  "auto"
+    -- picks a default from the device (ARM handhelds/phones drop the heavy
+    -- extras); scales TILT / GBC FX / survey ZOOM / FPS but never game
+    -- logic.  See src/core/Performance.lua.
+    performance = "auto",
     -- Per-pipeline display levels, keyed by render_pipelines id (see
     -- src/render/Pipelines.lua).  A level for a mod that is not installed
     -- is kept rather than pruned, so re-enabling the mod restores the mode
@@ -249,6 +254,24 @@ function SaveData.defaultOptions()
     -- Native mod enablement is an installation option, not save-slot data.
     -- Missing entries mean enabled so newly installed mods work by default.
     mods = {},
+    -- GitHub release checks for mods with a manifest "github" field
+    -- (src/mods/ModUpdate.lua). Keyed by owner/repo; TTL is six hours.
+    modUpdateCache = {},
+    -- Community mod indexes the player has chosen to browse
+    -- (src/mods/ModIndex.lua), in the order they added them.  Empty by
+    -- default and never populated automatically: adding an index is how a
+    -- player says they trust whoever publishes it, so the launcher asks
+    -- rather than shipping one.  Rows are { url, feed, base, fallback,
+    -- label }.
+    modIndexes = {},
+    -- Parsed index listings keyed by feed URL; TTL is 24 hours, matching how
+    -- often the feeds themselves rebuild.
+    modIndexCache = {},
+    -- On-screen touch overlay (Android/iOS; see src/core/TouchControls.lua).
+    -- enabled=false hides it permanently (distinct from auto-hide-on-gamepad).
+    -- positions are optional normalized centers {x=0..1, y=0..1} per control
+    -- (dpad/a/b/start/select); nil means the default layout.
+    touchControls = { enabled = true },
   }
 end
 
@@ -1035,7 +1058,7 @@ local function reclaim(save, data, report)
     if type(entry) == "table" and known(data.items, entry.id) then
       table.remove(orphaned.items, i)
       if entry.from == "pcItems" or type(save.inventory) ~= "table"
-          or not Bag.add(save, entry.id, entry.count or 1) then
+          or not Bag.add(save, entry.id, entry.count or 1, data) then
         save.pcItems = save.pcItems or {}
         save.pcItems[entry.id] = (save.pcItems[entry.id] or 0) + (entry.count or 1)
       end

src/core/TouchControls.lua

@@ -12,12 +12,18 @@
 -- (main.lua then drives it with the mouse); POKEPORT_TOUCH=0 forces it
 -- off everywhere.
 --
+-- Player preferences (options.touchControls) can permanently disable the
+-- overlay and/or override per-control positions as normalized window
+-- fractions.  The launcher editor (src/ui/TouchControlsEditor.lua) writes
+-- those; applyOptions reads them at boot and whenever options change.
+--
 -- Controls press GB buttons through Input:overlayPressed/Released -- their
 -- own input source, not a keyboard alias -- so a held overlay direction
 -- merges cleanly with a keyboard key or stick holding the same button,
 -- and a player rebind can never detach the overlay.
 
 local Input = require("src.core.Input")
+local SafeArea = require("src.core.SafeArea")
 
 local TouchControls = {}
 
@@ -39,6 +45,7 @@ local DPAD_DEAD = 0.16
 local SLOP = { a = 1.3, b = 1.3, start = 1.4, select = 1.4 }
 
 local BUTTONS = { "a", "b", "start", "select" }
+local CONTROLS = { "dpad", "a", "b", "start", "select" }
 
 local IMAGES = {
   dpad = "assets/touch/dpad.png",
@@ -52,6 +59,12 @@ local IMAGES = {
   select = "assets/touch/select.png",
 }
 
+local function clamp01(v)
+  if v < 0 then return 0 end
+  if v > 1 then return 1 end
+  return v
+end
+
 local function wantsOverlay()
   local env = os.getenv("POKEPORT_TOUCH")
   if env == "1" then return true end
@@ -60,8 +73,62 @@ local function wantsOverlay()
   return osName == "Android" or osName == "iOS"
 end
 
+-- Normalize a persisted touchControls table into {enabled, positions}.
+-- Unknown / garbage keys are dropped so a bad options.lua cannot brick
+-- the overlay.
+function TouchControls.normalizeConfig(tc)
+  local out = { enabled = true, positions = nil }
+  if type(tc) ~= "table" then return out end
+  if tc.enabled == false then out.enabled = false end
+  if type(tc.positions) == "table" then
+    local pos = {}
+    for _, name in ipairs(CONTROLS) do
+      local p = tc.positions[name]
+      if type(p) == "table" and type(p.x) == "number" and type(p.y) == "number" then
+        pos[name] = { x = clamp01(p.x), y = clamp01(p.y) }
+      end
+    end
+    if next(pos) then out.positions = pos end
+  end
+  return out
+end
+
+-- Pure default layout in LOVE units for a usable rect of size ww x wh at
+-- origin (ox, oy).  Shared by layout() and the editor's Reset path so
+-- defaults stay in one place.  ox/oy default to 0 for the headless tests
+-- and for callers that already pass a full-window size.
+function TouchControls.defaultLayout(ww, wh, ox, oy)
+  ox, oy = ox or 0, oy or 0
+  local short = math.min(ww, wh)
+  local dpadW = math.min(180, short * 0.34)
+  local abW = dpadW * 0.46
+  local ssW = dpadW * 0.30
+  local margin = dpadW * 0.12
+  return {
+    dpad = { cx = ox + margin + dpadW / 2, cy = oy + wh - margin - dpadW / 2, w = dpadW },
+    a = { cx = ox + ww - margin - abW * 0.55, cy = oy + wh - margin - abW * 1.75, w = abW },
+    b = { cx = ox + ww - margin - abW * 1.60, cy = oy + wh - margin - abW * 0.55, w = abW },
+    start = { cx = ox + ww / 2 + ssW * 0.60, cy = oy + wh - margin - ssW * 0.95, w = ssW },
+    select = { cx = ox + ww / 2 - ssW * 0.60, cy = oy + wh - margin - ssW * 0.95, w = ssW },
+  }
+end
+
+local function loadImages()
+  local img = {}
+  for name, path in pairs(IMAGES) do
+    local ok, im = pcall(love.graphics.newImage, path)
+    if not ok then return nil end
+    im:setFilter("linear", "linear")
+    img[name] = im
+  end
+  return img
+end
+
 function TouchControls:init()
   self.active = wantsOverlay()
+  self.enabled = true
+  self.positions = nil
+  self.preview = false
   self.controllerHidden = false
   self.touches = {}
   -- per-GB-button owner count: two fingers on A must not double-press it,
@@ -70,51 +137,94 @@ function TouchControls:init()
   self.dpadTouch = nil
   self.layoutW, self.layoutH = nil, nil
   self.img = nil
-  if not self.active then return end
-  -- soft-fail: a missing/corrupt PNG must never block boot; the overlay
-  -- stays off and keyboard/controller play still works
-  local img = {}
-  for name, path in pairs(IMAGES) do
-    local ok, im = pcall(love.graphics.newImage, path)
-    if not ok then
-      img = nil
-      break
-    end
-    -- smooth UI icons; the global default filter is nearest for GB pixels
-    im:setFilter("linear", "linear")
-    img[name] = im
+  -- Images load whenever the platform wants the overlay OR the launcher
+  -- editor forces a preview (desktop testing of the editor).
+  if self.active then
+    self.img = loadImages()
+  end
+end
+
+-- Ensure art is loaded for the launcher editor even when wantsOverlay()
+-- is false (desktop without POKEPORT_TOUCH).
+function TouchControls:ensureImages()
+  if self.img then return true end
+  self.img = loadImages()
+  return self.img ~= nil
+end
+
+-- Apply options.touchControls.  Called from Game:applyOptions and from
+-- the launcher editor after a save.
+function TouchControls:applyOptions(opts)
+  local cfg = TouchControls.normalizeConfig(opts and opts.touchControls)
+  self.enabled = cfg.enabled
+  self.positions = cfg.positions
+  self.layoutW, self.layoutH = nil, nil
+  self.layoutOx, self.layoutOy = nil, nil
+  if not self.enabled then
+    self.controllerHidden = false
+    self:reset()
+  end
+end
+
+function TouchControls:config()
+  return {
+    enabled = self.enabled ~= false,
+    positions = self.positions,
+  }
+end
+
+-- Preview mode: force-draw the overlay for the layout editor, ignoring
+-- platform / enabled / gamepad gates.  Gameplay input still respects
+-- enabled via touchpressed.
+function TouchControls:setPreview(on)
+  self.preview = on and true or false
+  if on then
+    self:ensureImages()
+    self.controllerHidden = false
   end
-  self.img = img
 end
 
 function TouchControls:visible()
-  return self.active and self.img ~= nil and not self.controllerHidden
+  if self.preview then return self.img ~= nil end
+  return self.active and self.enabled ~= false and self.img ~= nil
+     and not self.controllerHidden
+end
+
+-- Keep a control fully inside the usable rect [x0,y0]..[x1,y1].
+local function clampZone(zone, x0, y0, x1, y1)
+  local half = zone.w * 0.5
+  zone.cx = math.max(x0 + half, math.min(x1 - half, zone.cx))
+  zone.cy = math.max(y0 + half, math.min(y1 - half, zone.cy))
 end
 
 -- Layout in LOVE units (density-independent on mobile), recomputed when
--- the window size changes (rotation, resize).  D-pad bottom-left, B/A
--- bottom-right with A above B (the Game Boy diagonal), START/SELECT
--- flanking the bottom center.
+-- the window or safe area changes (rotation, resize, notch insets).
+-- Default: d-pad bottom-left, B/A bottom-right with A above B (the Game Boy
+-- diagonal), START/SELECT flanking the bottom center -- all inside the
+-- device safe area so thumbs clear the home indicator / cutouts.
+-- Custom positions (normalized 0..1 within the safe rect) override centers
+-- while sizes stay derived from the short edge.
 function TouchControls:layout()
-  local ww, wh = love.graphics.getDimensions()
-  if self.layoutW == ww and self.layoutH == wh then return self.L end
-  self.layoutW, self.layoutH = ww, wh
-  local short = math.min(ww, wh)
-  -- ~a third of the short edge, capped so tablets don't get a dinner plate
-  local dpadW = math.min(180, short * 0.34)
-  local abW = dpadW * 0.46
-  local ssW = dpadW * 0.30
-  local margin = dpadW * 0.12
-  -- START/SELECT hug the bottom center: on a narrow portrait phone the
-  -- d-pad and B leave little room, so a tight pair is what keeps them off
-  -- the neighboring controls
-  self.L = {
-    dpad = { cx = margin + dpadW / 2, cy = wh - margin - dpadW / 2, w = dpadW },
-    a = { cx = ww - margin - abW * 0.55, cy = wh - margin - abW * 1.75, w = abW },
-    b = { cx = ww - margin - abW * 1.60, cy = wh - margin - abW * 0.55, w = abW },
-    start = { cx = ww / 2 + ssW * 0.60, cy = wh - margin - ssW * 0.95, w = ssW },
-    select = { cx = ww / 2 - ssW * 0.60, cy = wh - margin - ssW * 0.95, w = ssW },
-  }
+  local ox, oy, sw, sh = SafeArea.rect()
+  if self.layoutW == sw and self.layoutH == sh
+     and self.layoutOx == ox and self.layoutOy == oy and self.L then
+    return self.L
+  end
+  self.layoutW, self.layoutH = sw, sh
+  self.layoutOx, self.layoutOy = ox, oy
+  self.L = TouchControls.defaultLayout(sw, sh, ox, oy)
+  if self.positions then
+    for _, name in ipairs(CONTROLS) do
+      local p = self.positions[name]
+      local zone = self.L[name]
+      if p and zone then
+        zone.cx = ox + p.x * sw
+        zone.cy = oy + p.y * sh
+        clampZone(zone, ox, oy, ox + sw, oy + sh)
+      end
+    end
+  end
+  local ssW = self.L.start.w
   local fontSize = math.max(8, math.floor(ssW * 0.26))
   if not self.labelFont or self.fontSize ~= fontSize then
     self.fontSize = fontSize
@@ -123,12 +233,49 @@ function TouchControls:layout()
   return self.L
 end
 
+-- Move one control to a screen-space point and persist its normalized
+-- position within the safe rect.  Used by the layout editor while dragging.
+function TouchControls:setControlCenter(name, cx, cy)
+  local ox, oy, sw, sh = SafeArea.rect()
+  local L = self:layout()
+  local zone = L[name]
+  if not zone then return end
+  zone.cx, zone.cy = cx, cy
+  clampZone(zone, ox, oy, ox + sw, oy + sh)
+  self.positions = self.positions or {}
+  self.positions[name] = {
+    x = sw > 0 and (zone.cx - ox) / sw or 0,
+    y = sh > 0 and (zone.cy - oy) / sh or 0,
+  }
+end
+
+function TouchControls:clearPositions()
+  self.positions = nil
+  self.layoutW, self.layoutH = nil, nil
+  self.layoutOx, self.layoutOy = nil, nil
+end
+
 local function inCircle(zone, x, y, slop)
   local r = zone.w * 0.5 * slop
   local dx, dy = x - zone.cx, y - zone.cy
   return dx * dx + dy * dy <= r * r
 end
 
+-- Which control (if any) contains (x, y).  Prefer face buttons over the
+-- d-pad when they overlap, matching touchpressed's order.
+function TouchControls:hitTest(x, y)
+  local L = self:layout()
+  for _, btn in ipairs(BUTTONS) do
+    if inCircle(L[btn], x, y, SLOP[btn]) then return btn end
+  end
+  local dz = L.dpad
+  local half = dz.w * 0.65
+  if math.abs(x - dz.cx) <= half and math.abs(y - dz.cy) <= half then
+    return "dpad"
+  end
+  return nil
+end
+
 local function dpadDir(zone, x, y)
   local dx, dy = x - zone.cx, y - zone.cy
   local dead = zone.w * DPAD_DEAD
@@ -165,7 +312,9 @@ local function setDpad(self, touch, dir)
 end
 
 function TouchControls:touchpressed(id, x, y)
-  if not (self.active and self.img) then return end
+  -- preview mode is layout-edit only: never press GB buttons
+  if self.preview then return end
+  if not (self.active and self.enabled ~= false and self.img) then return end
   -- a controller hid the overlay; the first touch only brings it back
   if self.controllerHidden then
     self.controllerHidden = false
@@ -192,6 +341,7 @@ function TouchControls:touchpressed(id, x, y)
 end
 
 function TouchControls:touchmoved(id, x, y)
+  if self.preview then return end
   local touch = self.touches[id]
   -- only the d-pad tracks movement (slide between directions without
   -- lifting); buttons hold until release wherever the finger wanders
@@ -200,6 +350,7 @@ function TouchControls:touchmoved(id, x, y)
 end
 
 function TouchControls:touchreleased(id, x, y)
+  if self.preview then return end
   local touch = self.touches[id]
   if not touch then return end
   self.touches[id] = nil
@@ -216,7 +367,7 @@ end
 -- touchreleased and would strand its button held forever.  Called from
 -- Game alongside Input:reset() on focus/visibility loss.
 function TouchControls:reset()
-  for btn in pairs(self.held) do
+  for btn in pairs(self.held or {}) do
     Input:overlayReleased(btn)
   end
   self.held = {}
@@ -225,9 +376,13 @@ function TouchControls:reset()
 end
 
 -- a gamepad is being used: hide the overlay (dropping anything it held)
--- until the next screen touch asks for it back
+-- until the next screen touch asks for it back.  No-op when the player
+-- permanently disabled the overlay -- there is nothing to hide, and a
+-- later accidental touch must not resurrect it.
 function TouchControls:noteGamepad()
-  if not self.active or self.controllerHidden then return end
+  if not self.active or self.enabled == false or self.controllerHidden then
+    return
+  end
   self.controllerHidden = true
   self:reset()
 end
@@ -242,40 +397,46 @@ function TouchControls:joystickremoved()
   end
 end
 
-local function drawIcon(img, zone, pressed)
-  love.graphics.setColor(1, 1, 1, pressed and BACK_PRESSED or BACK)
+local function drawIcon(img, zone, pressed, alphaMul)
+  alphaMul = alphaMul or 1
+  love.graphics.setColor(1, 1, 1, (pressed and BACK_PRESSED or BACK) * alphaMul)
   love.graphics.circle("fill", zone.cx, zone.cy, zone.w * 0.58)
   local scale = zone.w / img:getWidth()
-  love.graphics.setColor(1, 1, 1, pressed and ALPHA_PRESSED or ALPHA)
+  love.graphics.setColor(1, 1, 1, (pressed and ALPHA_PRESSED or ALPHA) * alphaMul)
   love.graphics.draw(img, zone.cx - zone.w / 2,
                      zone.cy - img:getHeight() * scale / 2, 0, scale, scale)
 end
 
 -- Screen-space, called by Game:draw after Renderer:endFrame so the
 -- overlay rides on top of everything (world, UI, CRT/GBC FX included).
+-- Also used by the launcher layout editor under preview mode.
 function TouchControls:draw()
   if not self:visible() then return end
   local L = self:layout()
+  -- when the player disabled the overlay but the editor is previewing,
+  -- draw dimmed so the layout is still editable
+  local alphaMul = (self.preview and self.enabled == false) and 0.45 or 1
   love.graphics.push("all")
   love.graphics.origin()
 
   local dpadTouch = self.dpadTouch and self.touches[self.dpadTouch]
   local dir = dpadTouch and dpadTouch.dir
   drawIcon(dir and self.img["dpad_" .. dir] or self.img.dpad, L.dpad,
-           dir ~= nil)
+           dir ~= nil, alphaMul)
   for _, btn in ipairs(BUTTONS) do
-    drawIcon(self.img[btn], L[btn], self.held[btn] ~= nil)
+    drawIcon(self.img[btn], L[btn], self.held[btn] ~= nil, alphaMul)
   end
 
   -- the +/- glyphs alone don't say which is which; shadowed so the text
-  -- reads on both the black letterbox and battle's white one
+  -- reads on both the black letterbox and battle's white one.  Each label
+  -- tracks its own control's cy/w so dragging START cannot move SELECT.
   love.graphics.setFont(self.labelFont)
-  local ly = L.start.cy + L.start.w * 0.66
   local function label(text, zone)
+    local ly = zone.cy + zone.w * 0.66
     local w = self.labelFont:getWidth(text)
-    love.graphics.setColor(0, 0, 0, 0.6)
+    love.graphics.setColor(0, 0, 0, 0.6 * alphaMul)
     love.graphics.print(text, zone.cx - w / 2 + 1, ly + 1)
-    love.graphics.setColor(1, 1, 1, ALPHA + 0.2)
+    love.graphics.setColor(1, 1, 1, (ALPHA + 0.2) * alphaMul)
     love.graphics.print(text, zone.cx - w / 2, ly)
   end
   label("START", L.start)
@@ -284,4 +445,6 @@ function TouchControls:draw()
   love.graphics.pop()
 end
 
+TouchControls.CONTROLS = CONTROLS
+
 return TouchControls

src/dev/Console.lua

@@ -214,7 +214,7 @@ function VERBS.give(self, rest)
     end
   elseif game.data.items and game.data.items[id] then
     local n = tonumber(count) or 1
-    if require("src.inventory.Bag").add(save, id, n) then
+    if require("src.inventory.Bag").add(save, id, n, game.data) then
       self:print(("%s x%d added"):format(id, n))
     else
       self:print("bag full")

src/import/RomExtractor.lua

@@ -1179,6 +1179,13 @@ function RomExtractor:extractPokemon()
     completed = completed + 1
     self:tick("Pokemon", completed, #self.manifest.dexOrder + 10)
   end
+  -- Yellow-only third back pic: LoadPlayerBackPic (engine/battle/core.asm)
+  -- picks OldManPicBack for BATTLE_TYPE_OLD_MAN but ProfOakPicBack for
+  -- BATTLE_TYPE_PIKACHU, the Pallet Town catch scene (#557).  Outside the
+  -- ticked loop so the progress denominator stays as it was.
+  if self.symbols["ProfOakPicBack"] then
+    self:writeCompressedPic("ProfOakPicBack", "battle/profoakb.png")
+  end
   local balls = self:symbol("PokeballTileGraphics")
   self:write2bpp(self.rom:bytes(balls.bank, balls.address, 64),
     32, 8, "battle/balls.png", true)
@@ -1826,6 +1833,35 @@ function RomExtractor:extractField()
     end
   end
 
+  -- Yellow-only: TalkToPikachu's framed portrait, one 5x5 base frame per
+  -- PikaPicAnimScript -- each script's FIRST pikapic_loadgfx in
+  -- data/pikachu/pikachu_pic_animation.asm, the pic PikaPicAnimBGFrames_4
+  -- (PikaAnimTilemap_1, column order) paints.  Scripts 18/22/23/24 have no
+  -- compressed base and take PikaPicAnimBGFrames_5 -> PikaAnimTilemap_9,
+  -- which is ROW order over a raw 25-tile sheet, hence no columns flag.
+  -- Script 26 shares script 11's base.  The pikaframe overlays each script
+  -- draws ON TOP of the base are a second full pose out of the same blob and
+  -- stay unripped: PikachuFollower.picLift stands in for their motion
+  -- (#561, still on #407's stand-in).
+  local PIKAPIC_BASE = {
+    "Pic_e4000", "Pic_e411c", "Pic_e4272", "Pic_e4383", "Pic_e458b",
+    "Pic_e467b", "Pic_e476e", "Pic_e49d1", "Pic_e4b39", "Pic_e4c3e",
+    "Pic_e5000", "Pic_e523f", "Pic_e548e", "Pic_e56d1", "Pic_e5924",
+    "Pic_e5b7d", "Pic_e5ddd", "GFX_e6020", "Pic_e6340", "Pic_e6587",
+    "Pic_e67d6", "GFX_e6e6f", "GFX_e718f", "GFX_e74af", "Pic_e77cf",
+    "Pic_e5000", "Pic_f0abf", "Pic_f0cf4",
+  }
+  if self.symbols[PIKAPIC_BASE[1]] then
+    for script, label in ipairs(PIKAPIC_BASE) do
+      local path = "pikachu/pikapic_" .. script .. ".png"
+      if label:sub(1, 4) == "GFX_" then
+        self:raw2bpp(label, 40, 40, path, { matte = true })
+      else
+        self:writeCompressedPic(label, path)
+      end
+    end
+  end
+
   self:raw1bpp("LedgeHoppingShadow", 8, 8,
     "fx/shadow.png", true); tick()
   for _, spec in ipairs({

src/inventory/Bag.lua

@@ -1,11 +1,26 @@
--- The 20-slot bag (BAG_ITEM_CAPACITY, constants/menu_constants.asm):
--- a distinct item id occupies one slot regardless of quantity; badges
--- live in the inventory table but are not bag items.  save.bagOrder
--- keeps acquisition order like wBagItems (SELECT can reorder it).
+-- The bag defaults to 20 slots (BAG_ITEM_CAPACITY,
+-- constants/menu_constants.asm), but mods may replace that limit through
+-- Data.constants.bagSize.  A distinct item id occupies one slot regardless
+-- of quantity; badges live in the inventory table but are not bag items.
+-- save.bagOrder keeps acquisition order like wBagItems (SELECT can reorder
+-- it).
 
 local Bag = {}
 
-Bag.CAPACITY = 20
+local DEFAULT_CAPACITY = 20
+
+-- `data` is injectable for the save editor and headless mod tests.  Normal
+-- gameplay may omit it because the loader merges mods into the Data
+-- singleton before any item can be added.  The fallback keeps old/stale
+-- generated caches and isolated callers at the vanilla limit.
+function Bag.capacity(data)
+  data = data or require("src.core.Data")
+  local configured = data and data.constants and data.constants.bagSize
+  if type(configured) == "number" and configured >= 1 then
+    return math.floor(configured)
+  end
+  return DEFAULT_CAPACITY
+end
 
 local function isBadge(id)
   return id:find("BADGE", 1, true) ~= nil
@@ -55,9 +70,10 @@ end
 -- Add qty of an item; returns false (and adds nothing) when a new slot
 -- is needed and the bag is full, or when the stack would pass 99
 -- (AddItemToInventory's per-slot quantity cap).
-function Bag.add(save, id, qty)
+function Bag.add(save, id, qty, data)
   local inv = save.inventory
-  if not inv[id] and not isBadge(id) and Bag.slots(save) >= Bag.CAPACITY then
+  if not inv[id] and not isBadge(id)
+      and Bag.slots(save) >= Bag.capacity(data) then
     return false
   end
   if not isBadge(id) and (inv[id] or 0) + (qty or 1) > 99 then

src/inventory/ItemEffects.lua

@@ -10,7 +10,6 @@
 --   "ball"                          caller must throw it (battle only)
 --   "learn", moveId                 caller must run the learn-move flow
 
-local Pokemon = require("src.pokemon.Pokemon")
 local Flags = require("src.script.Flags")
 local Strings = require("src.core.Strings")
 
@@ -433,6 +432,13 @@ function ItemEffects.use(data, save, itemId, target, battle, moveIndex, ow)
     if battle then
       return "failed", { Strings("OAK: %s!\nThis isn't the\ntime to use that!", save.player.name) }
     end
+    -- FishingInit (engine/items/item_effects.asm): cp wWalkBikeSurfState, 2
+    -- (surfing) sets carry, and every ItemUseXRod does jp c, ItemUseNotTime
+    -- on that carry -- surfing refuses the rod with the same OAK text as
+    -- the mid-battle case above, no rod-specific message (#533)
+    if ow and ow.player and ow.player.surfing then
+      return "failed", { Strings("OAK: %s!\nThis isn't the\ntime to use that!", save.player.name) }
+    end
     return "fish", itemId
   end
 

src/link/Fingerprint.lua

@@ -128,7 +128,14 @@ end
 
 -- ------- the link surface
 
-local SPECIES_FIELDS = { "baseStats", "types", "catchRate", "baseExp",
+-- catchRate stays out (#511): no link mode ever reads it -- a ball thrown
+-- in a link battle is a trainer-battle throw and always refused (pokered
+-- engine/items/item_effects.asm ItemUseBall), and the trade rebuild never
+-- touches it.  Hashing it split Red/Blue from Yellow, whose only link
+-- surface delta is the Dragonair/Dragonite catch-rate bytes
+-- (data/pokemon/base_stats/dragonair.asm db 45 vs 27, dragonite.asm 45
+-- vs 9), when the real cable links R/B/Y freely.
+local SPECIES_FIELDS = { "baseStats", "types", "baseExp",
                          "growthRate", "evolutions" }
 local MOVE_FIELDS = { "power", "type", "accuracy", "pp", "effect", "category",
                       "priority", "highCrit", "fixedDamage", "multiHit",

src/link/Protocol.lua

@@ -178,19 +178,16 @@ end
 
 -- ------- subset negotiation
 
--- the species and moves this party actually references, so the exchange
--- stays small (six mons) instead of shipping the whole catalog
+-- every record hash, not just this party's slice: the receiver filters
+-- its OWN party against these (eligibleParty), so a message limited to the
+-- sender's party read "not on the other game" for every species the two
+-- parties did not happen to share, and a subset trade between different
+-- games showed neither side (#511).  The full catalog is ~300 short hash
+-- strings -- still one message.
 function Protocol.recordsMessage(data, party)
-  local species = Fingerprint.records(data, "pokemon")
-  local moves = Fingerprint.records(data, "moves")
-  local outSpecies, outMoves = {}, {}
-  for _, mon in ipairs(party or {}) do
-    if species[mon.species] then outSpecies[mon.species] = species[mon.species] end
-    for _, mv in ipairs(mon.moves or {}) do
-      if moves[mv.id] then outMoves[mv.id] = moves[mv.id] end
-    end
-  end
-  return { type = "records", pokemon = outSpecies, moves = outMoves }
+  return { type = "records",
+           pokemon = Fingerprint.records(data, "pokemon"),
+           moves = Fingerprint.records(data, "moves") }
 end
 
 -- a mon may cross the wire only if both peers rebuild it identically: the

src/link/Tournament.lua

@@ -384,9 +384,16 @@ function Tournament:update(dt)
         else
           self.pendingBattleOpts.seed = msg.seed
         end
-        local battle, why = self.isHost
-          and LinkBattle.newHost(self.game, self.net, self.pendingBattleOpts)
-          or LinkBattle.newGuest(self.game, self.net, self.pendingBattleOpts)
+        -- Split rather than `cond and newHost() or newGuest()`: the and/or
+        -- idiom truncates a call to its first result, so the second return
+        -- (the specific reason) was always dropped and every failure showed
+        -- the generic fallback instead of "same mods on both games" etc.
+        local battle, why
+        if self.isHost then
+          battle, why = LinkBattle.newHost(self.game, self.net, self.pendingBattleOpts)
+        else
+          battle, why = LinkBattle.newGuest(self.game, self.net, self.pendingBattleOpts)
+        end
         if not battle then
           self:exitWith(why or Strings("Link battle\ncan't start."))
           return

src/mods/LauncherMods.lua

@@ -95,8 +95,15 @@ function LauncherMods.deriveList(manifests, options)
   local byId, enabledSet = {}, {}
   for _, m in ipairs(ordered) do
     byId[m.id] = m
-    -- missing entry means enabled, matching the loader's default
-    if mods[m.id] ~= false then enabledSet[m.id] = true end
+    -- missing entry means enabled, matching the loader -- except experimental
+    -- mods, which stay off until the player opts in
+    if mods[m.id] == false then
+      -- stay off
+    elseif mods[m.id] == true then
+      enabledSet[m.id] = true
+    elseif not m.experimental then
+      enabledSet[m.id] = true
+    end
   end
 
   local out = {}
@@ -104,16 +111,19 @@ function LauncherMods.deriveList(manifests, options)
     local enabled = enabledSet[m.id] == true
     local status, detail = statusFor(byId, m.id, enabledSet, enabled)
     local raw = m.raw or {}
+    local badge = tostring(raw.category or m.profile or "MOD"):upper()
+    if m.experimental then badge = "EXPERIMENTAL" end
     out[#out + 1] = {
       id = m.id,
       name = m.name or m.id,
       version = m.version,
-      -- category, then profile, then a generic fallback -- uppercased
-      badge = tostring(raw.category or m.profile or "MOD"):upper(),
+      badge = badge,
       description = m.description or "",
       enabled = enabled,
       status = status,
       statusDetail = detail,
+      github = m.github,
+      experimental = m.experimental == true,
     }
   end
   return out
@@ -213,7 +223,9 @@ local function discover()
   for _, name in ipairs(fs.getDirectoryItems("mods")) do
     local path = "mods/" .. name
     local info = fs.getInfo(path)
-    if info and info.type == "directory" then
+    -- a dev-linked mod dir (ln -s) reports type "symlink" even with
+    -- setSymlinksEnabled(true); see the matching note in Loader:_discover.
+    if info and (info.type == "directory" or info.type == "symlink") then
       local raw = fs.read(path .. "/manifest.json")
       if raw then
         local manifest = decodeManifest(raw, path)
@@ -231,8 +243,15 @@ end
 -- options.mods enable-state the loader persists, so a toggle here is what the
 -- game sees on its next boot.
 function LauncherMods.list()
-  local options = SaveData.loadOptions()
-  return LauncherMods.deriveList(discover(), options)
+  local ok, result = pcall(function()
+    local options = SaveData.loadOptions()
+    return LauncherMods.deriveList(discover(), options)
+  end)
+  if not ok then
+    -- a single bad options/mod file must not blank the launcher
+    return {}
+  end
+  return result or {}
 end
 
 -- setEnabled(id, enabled): persist options.mods[id] in the exact shape
@@ -454,13 +473,22 @@ function LauncherMods.strays() return scanStrays(false) end
 -- on the player's behalf is not this function's call to make.
 function LauncherMods.adoptStrays() return scanStrays(true) end
 
--- installZip(source) -> true, id  |  nil, errString
+-- installZip(source [, opts]) -> true, id  |  nil, errString
 -- source is an external path or a love DroppedFile.  The archive is validated
 -- BEFORE anything is copied; every path unmounts and clears the staged temp
 -- file, and a failed copy rolls its partial tree back.  A dropped file outside
 -- the save dir is staged into a save-dir temp first, because
 -- love.filesystem.mount only reaches a save-directory-relative path.
-function LauncherMods.installZip(source)
+-- opts.replace = true uninstalls an existing same-id mod first (updates /
+-- rollbacks).  opts.expectId, when set, refuses a zip whose manifest id differs.
+function LauncherMods.installZip(source, opts)
+  local ok, result, err = pcall(LauncherMods._installZipInner, source, opts)
+  if not ok then return nil, "import failed: " .. tostring(result) end
+  return result, err
+end
+
+function LauncherMods._installZipInner(source, opts)
+  opts = opts or {}
   if not (love and love.filesystem) then
     return nil, "mod install needs LOVE"
   end
@@ -501,12 +529,24 @@ function LauncherMods.installZip(source)
     cleanup()
     return nil, "invalid mod manifest: " .. tostring(manifestErr)
   end
+  if opts.expectId and manifest.id ~= opts.expectId then
+    cleanup()
+    return nil, ("zip is for '%s', expected '%s'")
+      :format(manifest.id, opts.expectId)
+  end
 
-  -- reject a duplicate before touching the mods tree
   local dest = "mods/" .. manifest.id
   if fs.getInfo(dest) then
-    cleanup()
-    return nil, "a mod named '" .. manifest.id .. "' is already installed"
+    if not opts.replace then
+      cleanup()
+      return nil, "a mod named '" .. manifest.id .. "' is already installed"
+    end
+    -- drop the old tree before copy; enable-flag is preserved (uninstall
+    -- would clear it, which would surprise an update)
+    local savedPrefix = CacheFs.prefix
+    CacheFs.prefix = ""
+    removeTree(dest)
+    CacheFs.prefix = savedPrefix
   end
 
   -- CacheFs.prefix steers ROM-cache writes into a version subtree (blue/...);
@@ -529,6 +569,56 @@ function LauncherMods.installZip(source)
   return true, manifest.id
 end
 
+-- Install (or replace) a mod from a GitHub release zip URL.
+-- Returns true, version  |  nil, errString. Soft-fails: download / install /
+-- cleanup errors never throw into the launcher UI.
+function LauncherMods.installFromRelease(modId, release)
+  local ok, result, err = pcall(function()
+    if type(modId) ~= "string" or modId == "" then
+      return nil, "missing mod id"
+    end
+    if type(release) ~= "table" or not release.zip or not release.zip.url then
+      return nil, "release has no downloadable .zip"
+    end
+    local ModUpdate = require("src.mods.ModUpdate")
+    local tmpName = ("mod_update_%s_%s.zip"):format(
+      tostring(modId), tostring(release.version or os.time()))
+    local localPath, dlErr = ModUpdate.downloadZip(release.zip.url, tmpName)
+    if not localPath then return nil, dlErr end
+    local installed, res = LauncherMods.installZip(localPath, {
+      replace = true, expectId = modId,
+    })
+    pcall(love.filesystem.remove, localPath)
+    if not installed then return nil, res end
+    return true, release.version or res
+  end)
+  if not ok then return nil, "install failed: " .. tostring(result) end
+  return result, err
+end
+
+-- Install a mod listed in a community index (src/mods/ModIndex.lua).
+-- The index only ever tells us WHERE the zip is; resolving that URL is
+-- ModIndex's job and installing it is installFromRelease's, so this is the
+-- seam between them and nothing about the archive is special-cased.  expectId
+-- comes from the listing, so a feed that points an entry at somebody else's
+-- zip fails the manifest check instead of installing the wrong mod.
+-- Returns true, version | nil, errString.
+function LauncherMods.installFromIndex(entry)
+  local ok, result, err = pcall(function()
+    if type(entry) ~= "table" or type(entry.id) ~= "string" then
+      return nil, "index entry has no mod id"
+    end
+    local ModIndex = require("src.mods.ModIndex")
+    local release, why = ModIndex.releaseFor(entry)
+    if not release then
+      return nil, why or "this mod cannot be installed from the index"
+    end
+    return LauncherMods.installFromRelease(entry.id, release)
+  end)
+  if not ok then return nil, "install failed: " .. tostring(result) end
+  return result, err
+end
+
 -- uninstall(id) -> true  |  nil, errString
 -- Removes mods/<id>/ from wherever it was installed (the portable game folder
 -- or the save directory, CacheFs decides -- #330) and clears options.mods[id]

src/mods/Loader.lua

@@ -206,7 +206,11 @@ function Loader:_discover()
       for _, name in ipairs(self.fs.getDirectoryItems(root)) do
         local path = root .. "/" .. name
         local info = self.fs.getInfo(path)
-        if info and info.type == "directory" then
+        -- a dev-linked mod dir (ln -s) reports type "symlink" even with
+        -- setSymlinksEnabled(true) -- PhysFS never resolves the symlink's
+        -- own getInfo, only traversal into it. readManifest below still
+        -- correctly no-ops on a symlink that isn't a directory.
+        if info and (info.type == "directory" or info.type == "symlink") then
           local manifest, err = readManifest(self.fs, path)
           if manifest then
             if self.mods[manifest.id] then
@@ -834,6 +838,18 @@ function Loader:load(data)
   require("src.mods.Builtins").install(self.content, data)
   self:_loadState()
   self:_discover()
+  -- Experimental mods stay off until the player opts in: a missing
+  -- options.mods entry normally means enabled, but experimental flips that.
+  do
+    local options = SaveData.loadOptions(self.fs)
+    local modsOpt = options.mods or {}
+    for id, mod in pairs(self.mods) do
+      if not self.disabled[id] and modsOpt[id] == nil
+          and mod.manifest.experimental then
+        self.disabled[id] = true
+      end
+    end
+  end
   for id, mod in pairs(self.mods) do
     mod.enabled = not self.disabled[id]
     mod.state = mod.enabled and "pending" or "disabled"

src/mods/ManagerState.lua

@@ -324,6 +324,12 @@ function ManagerState:detailRows(m)
     rows[#rows + 1] = { label = Strings("PERMISSIONS.."),
       action = function() self:goTo("permissions") end }
   end
+  if m.github then
+    rows[#rows + 1] = { inert = true, label = "GH " .. m.github }
+  end
+  if m.experimental then
+    rows[#rows + 1] = { inert = true, label = "EXPERIMENTAL" }
+  end
   if m.error then
     rows[#rows + 1] = { label = Strings("VIEW ERROR.."),
       action = function() self:goTo("errors") end }
@@ -607,13 +613,26 @@ function ManagerState:beginToggle(m)
     r = ManagerState.resolveToggle(self:manifestMap(), m.id, want,
                                    self:enabledSet())
   end
-  if #r.missing > 0 or #r.conflicts > 0 or #r.badVersion > 0 then
-    self:openBlocked(r)
-  elseif #r.alsoEnable > 0 or #r.alsoDisable > 0 then
-    self:openCascade(r, m, want)
-  else
-    self:commitToggle(r.apply)
+  local function proceed()
+    if #r.missing > 0 or #r.conflicts > 0 or #r.badVersion > 0 then
+      self:openBlocked(r)
+    elseif #r.alsoEnable > 0 or #r.alsoDisable > 0 then
+      self:openCascade(r, m, want)
+    else
+      self:commitToggle(r.apply)
+    end
   end
+  -- Experimental mods ask once on enable; disable is silent.
+  if want and m.experimental then
+    self:openConfirm({
+      "EXPERIMENTAL MOD",
+      "THIS MOD IS MARKED",
+      "EXPERIMENTAL.",
+      "ENABLE ANYWAY?",
+    }, proceed)
+    return
+  end
+  proceed()
 end
 
 function ManagerState:commitToggle(apply)

src/mods/Manifest.lua

@@ -50,6 +50,42 @@ local function parseSpecs(list, field)
   return specs
 end
 
+-- Optional GitHub repo for launcher auto-update / other-versions.
+-- Accepts "owner/repo" or a github.com URL; empty/absent means no updates.
+function Manifest.parseGithub(value)
+  if value == nil or value == "" then return nil end
+  assert(type(value) == "string", "github must be a string")
+  local trimmed = value:match("^%s*(.-)%s*$") or value
+  if trimmed == "" then return nil end
+  local owner, repo = trimmed:match(
+    "^https?://github%.com/([%w%._%-]+)/([%w%._%-]+)/?$")
+  if not owner then
+    owner, repo = trimmed:match(
+      "^https?://github%.com/([%w%._%-]+)/([%w%._%-]+)%.git/?$")
+  end
+  if not owner then
+    owner, repo = trimmed:match("^([%w%._%-]+)/([%w%._%-]+)$")
+  end
+  assert(owner and repo and owner ~= "" and repo ~= "",
+    "github must be owner/repo or a github.com URL")
+  repo = repo:gsub("%.git$", "")
+  return owner .. "/" .. repo
+end
+
+-- conflicts + incompatible (alias) merged, first-wins on duplicate ids
+local function mergeConflictLists(conflicts, incompatible)
+  local seen, out = {}, {}
+  for _, list in ipairs({ array(conflicts), array(incompatible) }) do
+    for _, entry in ipairs(list) do
+      if not seen[entry] then
+        seen[entry] = true
+        out[#out + 1] = entry
+      end
+    end
+  end
+  return out
+end
+
 function Manifest.validate(raw, path)
   assert(type(raw) == "table", "manifest must be an object")
   assert(type(raw.id) == "string" and raw.id:match("^[%w_%-]+$"),
@@ -86,6 +122,12 @@ function Manifest.validate(raw, path)
   assert(gameVersionOk, ("malformed game_version %q: %s")
     :format(tostring(raw.game_version), tostring(gameVersionErr)))
 
+  local github = Manifest.parseGithub(raw.github)
+
+  assert(raw.experimental == nil or type(raw.experimental) == "boolean",
+    "experimental must be a boolean")
+  local experimental = raw.experimental == true
+
   -- overhauls and total conversions are assumed to move the link
   -- fingerprint unless the manifest says otherwise; content packs are not
   local affectsLink = profile ~= "content"
@@ -97,6 +139,8 @@ function Manifest.validate(raw, path)
     return value
   end
 
+  local conflicts = mergeConflictLists(raw.conflicts, raw.incompatible)
+
   return {
     id = raw.id,
     name = raw.name,
@@ -106,13 +150,16 @@ function Manifest.validate(raw, path)
     priority = tonumber(raw.priority) or 0,
     dependencies = array(raw.dependencies),
     optional_dependencies = array(raw.optional_dependencies),
-    conflicts = array(raw.conflicts),
+    conflicts = conflicts,
+    incompatible = array(raw.incompatible),
     dependencySpecs = parseSpecs(array(raw.dependencies), "dependencies"),
     optionalSpecs = parseSpecs(array(raw.optional_dependencies), "optional_dependencies"),
-    conflictSpecs = parseSpecs(array(raw.conflicts), "conflicts"),
+    conflictSpecs = parseSpecs(conflicts, "conflicts"),
     category = raw.category or "OTHER",
     game_version = raw.game_version,
     description = raw.description or "",
+    github = github,
+    experimental = experimental,
     profile = profile,
     affects_link = affectsLink,
     permissions = permissions,

src/mods/ModIndex.lua

@@ -0,0 +1,623 @@
+-- Community mod index consumer (the "Find mods" launcher tab).
+--
+-- An index is metadata only: a published index.json feed listing mods that
+-- live in their authors' own repos.  Nothing here clones or vendors the index
+-- repo -- the feed is the whole contract, and every install still goes through
+-- the same LauncherMods.installZip path an "Import mod .zip" does, so a listing
+-- buys a mod no trust it would not otherwise have.
+--
+-- Shape of the split mirrors src/mods/ModUpdate.lua, which this borrows its
+-- host I/O from: everything above "host I/O" is pure (no love, no filesystem,
+-- no network) so the engine tier can table-drive it, and the fetch/cache half
+-- reaches for curl and options.lua.
+--
+-- Sources are never added automatically.  options.modIndexes is a player-built
+-- list -- adding an index is a deliberate act of trusting whoever publishes it,
+-- so the launcher ships with none and asks.
+--
+-- schema_version is a hard gate, not a hint: a bumped feed may reuse a field
+-- name for something else, so an unknown version is refused outright rather
+-- than parsed hopefully.
+
+local ModIndex = {}
+
+-- The feed is rebuilt on every push and refreshed nightly, so a day-old copy
+-- is the worst a cached listing can be.  ModUpdate's six hours is tuned for a
+-- single repo's releases; a whole index is heavier and changes more slowly.
+ModIndex.CACHE_TTL = 24 * 60 * 60
+ModIndex.SCHEMA_VERSION = 1
+
+-- ------- pure: source resolution
+
+local function trim(s)
+  return (tostring(s):gsub("^%s+", ""):gsub("%s+$", ""))
+end
+
+-- Split "owner/repo" out of the several ways a player can name a GitHub repo.
+local function githubSlug(url)
+  local owner, repo = url:match("^https?://github%.com/([%w%-%.]+)/([%w%-%.]+)")
+  if not owner then
+    owner, repo = url:match("^([%w%-%.]+)/([%w%-%.]+)$")
+  end
+  if not owner then return nil end
+  repo = repo:gsub("%.git$", "")
+  return owner, repo
+end
+
+-- resolveSource(input) -> { feed, base, fallback, label } | nil, err
+--
+-- Players paste whichever URL they happened to have, so all four shapes of the
+-- same index resolve to one source: the Pages root, the feed file itself, the
+-- GitHub repo page, or a bare "owner/repo".  `base` is what relative thumbnail
+-- and description_url paths resolve against, and it always keeps its trailing
+-- slash so joinUrl can stay a concatenation.
+--
+-- The raw.githubusercontent fallback exists because Pages deploys lag a push
+-- by a minute or two; it is only ever consulted when the feed fetch fails.
+function ModIndex.resolveSource(input)
+  if type(input) ~= "string" then return nil, "missing index URL" end
+  local url = trim(input)
+  if url == "" then return nil, "missing index URL" end
+
+  local owner, repo = githubSlug(url)
+  if owner then
+    return {
+      feed = ("https://%s.github.io/%s/data/index.json"):format(owner, repo),
+      base = ("https://%s.github.io/%s/"):format(owner, repo),
+      fallback = ("https://raw.githubusercontent.com/%s/%s/main/site/data/index.json")
+        :format(owner, repo),
+      label = owner .. "/" .. repo,
+    }
+  end
+
+  if not url:match("^https?://") then
+    return nil, "index must be an http(s) URL or owner/repo"
+  end
+
+  -- A feed URL names the file; the Pages root is what is left once the
+  -- "data/index.json" tail comes off (any other .json keeps only its folder).
+  if url:match("%.json$") then
+    local base = url:match("^(.*/)data/index%.json$") or url:match("^(.*/)")
+    return { feed = url, base = base or url, label = ModIndex.labelFor(base or url) }
+  end
+
+  local base = url:match("/$") and url or (url .. "/")
+  return {
+    feed = base .. "data/index.json",
+    base = base,
+    label = ModIndex.labelFor(base),
+  }
+end
+
+-- A short human name for a source row: "owner/repo" for a Pages host, else the
+-- host plus first path segment.  Only ever cosmetic.
+function ModIndex.labelFor(url)
+  url = tostring(url or "")
+  local owner, repo = url:match("^https?://([%w%-%.]+)%.github%.io/([%w%-%.]+)/")
+  if owner then return owner .. "/" .. repo end
+  local host, first = url:match("^https?://([^/]+)/([^/]*)")
+  if host and first and first ~= "" then return host .. "/" .. first end
+  return host or url
+end
+
+-- joinUrl(base, rel) -> absolute URL | nil
+-- Relative feed paths resolve against the Pages root; an already-absolute one
+-- is handed back untouched (the schema allows either), and anything else --
+-- nil, "", a non-string -- is simply absent rather than an error, because a
+-- missing thumbnail is not a broken index.
+function ModIndex.joinUrl(base, rel)
+  if type(rel) ~= "string" or rel == "" then return nil end
+  if rel:match("^https?://") then return rel end
+  if type(base) ~= "string" or base == "" then return nil end
+  if not base:match("/$") then base = base .. "/" end
+  return base .. (rel:gsub("^/", ""))
+end
+
+-- ------- pure: feed parsing
+
+local function str(v)
+  return type(v) == "string" and v or nil
+end
+
+local function strArray(v)
+  local out = {}
+  if type(v) == "table" then
+    for _, entry in ipairs(v) do
+      if type(entry) == "string" then out[#out + 1] = entry end
+    end
+  end
+  return out
+end
+
+-- Decode one release blob from the feed's `latest` field into the same shape
+-- ModUpdate.parseRelease produces, so LauncherMods.installFromRelease takes it
+-- without a translation layer.
+local function parseLatest(raw)
+  if type(raw) ~= "table" then return nil end
+  local zip = nil
+  if type(raw.zip) == "table" and str(raw.zip.url) then
+    zip = { name = str(raw.zip.name), url = raw.zip.url,
+            size = tonumber(raw.zip.size) }
+  end
+  return {
+    version = str(raw.version),
+    tag = str(raw.tag),
+    name = str(raw.name),
+    prerelease = raw.prerelease == true,
+    published_at = str(raw.published_at),
+    zip = zip,
+  }
+end
+
+local function parseEntry(raw)
+  if type(raw) ~= "table" or not str(raw.id) then return nil end
+  return {
+    folder = str(raw.folder),
+    id = raw.id,
+    title = str(raw.title) or raw.id,
+    author = str(raw.author),
+    version = str(raw.version),
+    summary = str(raw.summary) or "",
+    categories = strArray(raw.categories),
+    tags = strArray(raw.tags),
+    license = str(raw.license),
+    repo = str(raw.repo),
+    github = str(raw.github),
+    downloadURL = str(raw.downloadURL),
+    api = tonumber(raw.api),
+    game_version = str(raw.game_version),
+    profile = str(raw.profile),
+    affects_link = raw.affects_link == true,
+    experimental = raw.experimental == true,
+    permissions = strArray(raw.permissions),
+    dependencies = raw.dependencies,
+    conflicts = raw.conflicts,
+    thumbnail = str(raw.thumbnail),
+    description_url = str(raw.description_url),
+    latest = parseLatest(raw.latest),
+    update_check = str(raw.update_check) or "pending",
+  }
+end
+
+-- parse(jsonText [, Json]) -> { schemaVersion, generatedAt, categories, mods }
+--                          |  nil, err
+-- Never throws: a truncated download, an HTML error page, or a feed from a
+-- future schema all come back as a message the panel can print.
+function ModIndex.parse(jsonText, Json)
+  local ok, result, err = pcall(function()
+    Json = Json or require("src.link.Json")
+    local doc, decodeErr = Json.decode(jsonText)
+    if type(doc) ~= "table" then
+      return nil, decodeErr or "index.json is not an object"
+    end
+    local schema = tonumber(doc.schema_version)
+    if schema == nil then
+      return nil, "index.json has no schema_version"
+    end
+    if schema ~= ModIndex.SCHEMA_VERSION then
+      return nil, ("index schema %d is not supported (this build reads %d)")
+        :format(schema, ModIndex.SCHEMA_VERSION)
+    end
+    if type(doc.mods) ~= "table" then
+      return nil, "index.json has no mods array"
+    end
+    local mods = {}
+    for _, raw in ipairs(doc.mods) do
+      local entry = parseEntry(raw)
+      if entry then mods[#mods + 1] = entry end
+    end
+    return {
+      schemaVersion = schema,
+      generatedAt = str(doc.generated_at),
+      categories = strArray(doc.categories),
+      mods = mods,
+    }
+  end)
+  if not ok then return nil, "could not read the index: " .. tostring(result) end
+  return result, err
+end
+
+-- ------- pure: install resolution
+
+-- installUrl(entry) -> url, kind  |  nil, reason
+--
+-- The same order the engine's zip import already implies: a verified release
+-- asset first, then the author's fixed downloadURL.  A GitHub source-archive
+-- URL is never invented -- codeload gives you the repo, not the built mod, and
+-- the folder layout would be wrong even when the download succeeds.
+function ModIndex.installUrl(entry)
+  if type(entry) ~= "table" then return nil, "no entry" end
+  if entry.update_check == "ok" and entry.latest and entry.latest.zip
+      and entry.latest.zip.url then
+    return entry.latest.zip.url, "release"
+  end
+  if entry.downloadURL and entry.downloadURL ~= "" then
+    return entry.downloadURL, "download"
+  end
+  if entry.update_check == "off" then
+    return nil, "the author does not publish installable releases"
+  end
+  if entry.update_check == "no installable release" then
+    return nil, "no release with a .zip asset yet"
+  end
+  if type(entry.update_check) == "string"
+      and entry.update_check:match("^error") then
+    return nil, entry.update_check
+  end
+  return nil, "nothing installable listed"
+end
+
+function ModIndex.canInstall(entry)
+  return ModIndex.installUrl(entry) ~= nil
+end
+
+-- The version to show on a card: the release the index resolved when it could
+-- reach GitHub, else whatever meta.json declared.
+function ModIndex.displayVersion(entry)
+  if type(entry) ~= "table" then return "?" end
+  if entry.update_check == "ok" and entry.latest and entry.latest.version then
+    return entry.latest.version
+  end
+  return entry.version or "?"
+end
+
+-- The release table LauncherMods.installFromRelease wants.  A downloadURL
+-- entry has no release behind it, so one is synthesised around the URL; the
+-- installer still validates the manifest inside and still refuses a zip whose
+-- id is not the one being installed.
+function ModIndex.releaseFor(entry)
+  local url, kind = ModIndex.installUrl(entry)
+  if not url then return nil, kind end
+  if kind == "release" then return entry.latest end
+  return {
+    version = ModIndex.displayVersion(entry),
+    zip = { url = url, name = entry.id .. ".zip" },
+  }
+end
+
+-- ------- pure: compatibility
+
+-- compatIssues(entry, ctx) -> array of { level, text }
+--
+-- Soft gate by design: an index entry is metadata an author wrote, possibly
+-- months ago, and hiding a mod because a range looks wrong is how a working
+-- mod becomes invisible.  Everything here warns; the confirm dialog shows the
+-- list and the player decides.  ctx carries { modApi, engineVersion,
+-- installed = { id -> version }, enabled = { id -> true } }.
+function ModIndex.compatIssues(entry, ctx)
+  local out = {}
+  if type(entry) ~= "table" then return out end
+  ctx = ctx or {}
+  local function warn(text) out[#out + 1] = { level = "warn", text = text } end
+
+  local modApi = tonumber(ctx.modApi)
+  if entry.api and modApi and entry.api > modApi then
+    warn(("Needs mod API %d; this build provides %d")
+      :format(entry.api, modApi))
+  end
+
+  if entry.game_version and ctx.engineVersion then
+    local okSemver, Semver = pcall(require, "src.mods.Semver")
+    if okSemver and not Semver.satisfies(ctx.engineVersion, entry.game_version) then
+      warn(("Needs engine %s (have %s)")
+        :format(entry.game_version, ctx.engineVersion))
+    end
+  end
+
+  if entry.profile and entry.profile ~= "content" then
+    warn(("Profile '%s' changes engine behaviour beyond content")
+      :format(entry.profile))
+  end
+  if entry.affects_link then
+    warn("Changes link play; both sides need the same mods")
+  end
+  if entry.experimental then
+    warn("Marked experimental by its author")
+  end
+
+  for _, name in ipairs(entry.permissions or {}) do
+    warn("Requests permission: " .. name)
+  end
+
+  -- dependencies / conflicts arrive as the manifest's own vocabulary: either
+  -- an array of "id" / "id@<range>" strings or an id -> range map.
+  local installed = ctx.installed or {}
+  local function eachSpec(spec, fn)
+    if type(spec) ~= "table" then return end
+    for k, v in pairs(spec) do
+      if type(k) == "number" and type(v) == "string" then
+        local id, range = v:match("^([^@]+)@(.+)$")
+        fn(id or v, range)
+      elseif type(k) == "string" then
+        fn(k, type(v) == "string" and v or nil)
+      end
+    end
+  end
+
+  eachSpec(entry.dependencies, function(id, range)
+    if installed[id] == nil then
+      warn("Needs " .. id .. (range and (" " .. range) or "") .. " (not installed)")
+    end
+  end)
+  eachSpec(entry.conflicts, function(id)
+    if installed[id] ~= nil then
+      warn("Conflicts with installed " .. id)
+    end
+  end)
+
+  return out
+end
+
+-- ------- pure: search / filter
+
+local function haystack(entry)
+  return (tostring(entry.title or "") .. " " .. tostring(entry.author or "")
+    .. " " .. tostring(entry.summary or "") .. " " .. tostring(entry.id or ""))
+    :lower()
+end
+
+-- matches(entry, query) -> bool.  Every whitespace-separated term must appear
+-- somewhere in title / author / summary / id, so typing more narrows.
+function ModIndex.matches(entry, query)
+  if type(query) ~= "string" or trim(query) == "" then return true end
+  local hay = haystack(entry)
+  for term in trim(query):lower():gmatch("%S+") do
+    if not hay:find(term, 1, true) then return false end
+  end
+  return true
+end
+
+-- filter(mods, opts) -> a new array.  opts = { query, category, tag }.
+-- Category and tag compare case-insensitively; feed order (already sorted by
+-- title) is preserved.
+function ModIndex.filter(mods, opts)
+  opts = opts or {}
+  local want = opts.category and tostring(opts.category):lower() or nil
+  local wantTag = opts.tag and tostring(opts.tag):lower() or nil
+  local out = {}
+  for _, entry in ipairs(mods or {}) do
+    local keep = ModIndex.matches(entry, opts.query)
+    if keep and want then
+      keep = false
+      for _, c in ipairs(entry.categories or {}) do
+        if tostring(c):lower() == want then keep = true; break end
+      end
+    end
+    if keep and wantTag then
+      keep = false
+      for _, t in ipairs(entry.tags or {}) do
+        if tostring(t):lower() == wantTag then keep = true; break end
+      end
+    end
+    if keep then out[#out + 1] = entry end
+  end
+  return out
+end
+
+-- Every category actually used by a feed, in the feed's declared order, with
+-- anything an entry names that the header forgot appended.  Drives the filter
+-- row without hard-coding the vocabulary.
+function ModIndex.categoriesIn(index)
+  local out, seen = {}, {}
+  if type(index) ~= "table" then return out end
+  local used = {}
+  for _, entry in ipairs(index.mods or {}) do
+    for _, c in ipairs(entry.categories or {}) do used[c] = true end
+  end
+  for _, c in ipairs(index.categories or {}) do
+    if used[c] and not seen[c] then seen[c] = true; out[#out + 1] = c end
+  end
+  for _, entry in ipairs(index.mods or {}) do
+    for _, c in ipairs(entry.categories or {}) do
+      if not seen[c] then seen[c] = true; out[#out + 1] = c end
+    end
+  end
+  return out
+end
+
+-- ------- sources (options.modIndexes)
+
+local function loadOptions()
+  return require("src.core.SaveData").loadOptions()
+end
+
+-- The player's index list, normalised.  Rows are { url, feed, base, fallback,
+-- label }; `url` is what they typed, kept so the row reads back the way they
+-- entered it.
+function ModIndex.sources()
+  local ok, opts = pcall(loadOptions)
+  if not ok or type(opts) ~= "table" then return {} end
+  local out = {}
+  for _, row in ipairs(opts.modIndexes or {}) do
+    if type(row) == "table" and type(row.feed) == "string" then
+      out[#out + 1] = row
+    end
+  end
+  return out
+end
+
+-- addSource(input) -> row | nil, err.  Idempotent on the resolved feed URL, so
+-- pasting the repo page and the Pages root in either order adds one source.
+function ModIndex.addSource(input)
+  local source, err = ModIndex.resolveSource(input)
+  if not source then return nil, err end
+  local ok, result, addErr = pcall(function()
+    local SaveData = require("src.core.SaveData")
+    local opts = loadOptions()
+    opts.modIndexes = opts.modIndexes or {}
+    for _, row in ipairs(opts.modIndexes) do
+      if row.feed == source.feed then
+        return nil, "that index is already added"
+      end
+    end
+    source.url = trim(input)
+    opts.modIndexes[#opts.modIndexes + 1] = source
+    SaveData.saveOptions(opts)
+    return source
+  end)
+  if not ok then return nil, "could not save the index: " .. tostring(result) end
+  return result, addErr
+end
+
+-- removeSource(feed) -> true | nil, err.  Drops the cached listing with it:
+-- keeping a feed's mods around after its source is gone is how a stale card
+-- outlives the index it came from.
+function ModIndex.removeSource(feed)
+  if type(feed) ~= "string" or feed == "" then return nil, "missing index" end
+  local ok, result = pcall(function()
+    local SaveData = require("src.core.SaveData")
+    local opts = loadOptions()
+    local kept, found = {}, false
+    for _, row in ipairs(opts.modIndexes or {}) do
+      if row.feed == feed then found = true else kept[#kept + 1] = row end
+    end
+    if not found then return nil end
+    opts.modIndexes = kept
+    if type(opts.modIndexCache) == "table" then opts.modIndexCache[feed] = nil end
+    SaveData.saveOptions(opts)
+    return true
+  end)
+  if not ok then return nil, tostring(result) end
+  if not result then return nil, "that index is not in the list" end
+  return true
+end
+
+-- ------- cache (options.modIndexCache[feed])
+
+function ModIndex.readCache(feed)
+  if type(feed) ~= "string" or feed == "" then return nil end
+  local ok, opts = pcall(loadOptions)
+  if not ok or type(opts) ~= "table" then return nil end
+  local entry = opts.modIndexCache and opts.modIndexCache[feed]
+  if type(entry) ~= "table" or type(entry.checkedAt) ~= "number" then
+    return nil
+  end
+  if type(entry.mods) ~= "table" then return nil end
+  return entry
+end
+
+function ModIndex.cacheFresh(entry, now, ttl)
+  now = now or os.time()
+  ttl = ttl or ModIndex.CACHE_TTL
+  return entry ~= nil and type(entry.checkedAt) == "number"
+    and (now - entry.checkedAt) < ttl
+end
+
+function ModIndex.writeCache(feed, index)
+  if type(feed) ~= "string" or feed == "" then return false end
+  local ok = pcall(function()
+    local SaveData = require("src.core.SaveData")
+    local opts = loadOptions()
+    opts.modIndexCache = opts.modIndexCache or {}
+    opts.modIndexCache[feed] = {
+      checkedAt = os.time(),
+      generatedAt = index.generatedAt,
+      categories = index.categories,
+      mods = index.mods,
+    }
+    SaveData.saveOptions(opts)
+  end)
+  return ok
+end
+
+-- ------- host I/O (curl, via ModUpdate's shell plumbing)
+
+local function shq(s)
+  s = tostring(s)
+  if love and love.system and love.system.getOS
+      and love.system.getOS() == "Windows" then
+    return '"' .. s:gsub('"', '') .. '"'
+  end
+  return "'" .. s:gsub("'", "'\\''") .. "'"
+end
+
+-- Plain GET returning the body.  No GitHub Accept header: the feed and the
+-- description markdown are static files on Pages, and the public feed is
+-- explicitly unauthenticated.
+function ModIndex.httpGet(url)
+  local ModUpdate = require("src.mods.ModUpdate")
+  if not ModUpdate.haveCurl() then
+    return nil, "curl is not available on this platform"
+  end
+  local HostShell = require("src.core.HostShell")
+  local cmd = "curl -fsSL --connect-timeout 10 --max-time 40 "
+    .. "-H " .. shq("User-Agent: gen1recomp-mod-index") .. " "
+    .. shq(url)
+  local pipeOk, pipe = pcall(HostShell.popen, cmd)
+  if not pipeOk or not pipe then return nil, "could not run curl" end
+  local readOk, out = pcall(function() return pipe:read("*a") end)
+  pcall(function() pipe:close() end)
+  if not readOk then return nil, "fetch failed: " .. tostring(out) end
+  if not out or out == "" then return nil, "empty response from " .. url end
+  return out
+end
+
+-- fetch(source, opts) -> index, err, meta
+-- index is the parse() table; meta is { fromCache, stale }.  opts.force skips
+-- the 24h cache.  A failed live fetch falls back to whatever is cached, marked
+-- stale, so going offline degrades the listing rather than emptying it.
+function ModIndex.fetch(source, opts)
+  opts = opts or {}
+  if type(source) ~= "table" or type(source.feed) ~= "string" then
+    return nil, "missing index source"
+  end
+  local feed = source.feed
+
+  local function cached(stale)
+    local entry = ModIndex.readCache(feed)
+    if not entry then return nil end
+    return {
+      schemaVersion = ModIndex.SCHEMA_VERSION,
+      generatedAt = entry.generatedAt,
+      categories = entry.categories or {},
+      mods = entry.mods or {},
+    }, nil, { fromCache = true, stale = stale, checkedAt = entry.checkedAt }
+  end
+
+  if not opts.force then
+    local entry = ModIndex.readCache(feed)
+    if ModIndex.cacheFresh(entry) then return cached(false) end
+  end
+
+  local body, err = ModIndex.httpGet(feed)
+  -- Pages deploys trail a push; the raw mirror is the same file, so a feed
+  -- that 404s right after a release is worth one retry elsewhere before it
+  -- counts as an outage.
+  if not body and source.fallback then
+    body = ModIndex.httpGet(source.fallback)
+  end
+  if not body then
+    local index, _, meta = cached(true)
+    if index then return index, nil, meta end
+    return nil, err
+  end
+
+  local index, parseErr = ModIndex.parse(body)
+  if not index then
+    local stale, _, meta = cached(true)
+    if stale then return stale, parseErr, meta end
+    return nil, parseErr
+  end
+  ModIndex.writeCache(feed, index)
+  return index, nil, { fromCache = false, checkedAt = os.time() }
+end
+
+-- Fetch a description_url / any index-relative text file.  Returns the raw
+-- markdown; callers run it through ModUpdate.cleanBody for display.
+function ModIndex.fetchText(url)
+  if type(url) ~= "string" or url == "" then return nil, "no description" end
+  return ModIndex.httpGet(url)
+end
+
+-- Download a thumbnail into the save directory and return the love.filesystem
+-- relative path.  Reuses ModUpdate.downloadZip, which is a plain curl -o with
+-- a non-empty-file check -- nothing in it is zip-specific.
+function ModIndex.downloadThumbnail(url, modId)
+  if type(url) ~= "string" or url == "" then return nil, "no thumbnail" end
+  local ModUpdate = require("src.mods.ModUpdate")
+  local ext = url:match("%.(%a%a%a?%a?)$") or "png"
+  local name = ("mod_thumb_%s.%s"):format(tostring(modId):gsub("[^%w%-_]", "_"), ext)
+  return ModUpdate.downloadZip(url, name)
+end
+
+return ModIndex

src/mods/ModUpdate.lua

@@ -0,0 +1,361 @@
+-- GitHub release helpers for mod auto-update / other-versions.
+-- Pure parsing is love-free; fetch/download use HostShell + curl when available.
+-- Release lists are cached in options.modUpdateCache for CACHE_TTL seconds
+-- (default 6 hours). The launcher owns UI and install.
+
+local ModUpdate = {}
+
+ModUpdate.CACHE_TTL = 6 * 60 * 60  -- six hours
+
+local function stripV(tag)
+  return (tostring(tag):gsub("^[vV]", ""))
+end
+
+-- Prefer "<id>-<version>.zip", then any "<id>*.zip", then the first .zip.
+function ModUpdate.pickZipAsset(assets, modId, version)
+  if type(assets) ~= "table" then return nil end
+  local prefer = nil
+  if modId and version then
+    prefer = tostring(modId) .. "-" .. tostring(version) .. ".zip"
+  end
+  local idPrefix, idPrefixZip, anyZip = nil, nil, nil
+  if modId then idPrefix = tostring(modId):lower() end
+  for _, a in ipairs(assets) do
+    if type(a) == "table" and type(a.name) == "string" then
+      local name = a.name
+      if name:lower():match("%.zip$") then
+        local row = {
+          name = name,
+          url = a.browser_download_url,
+          size = tonumber(a.size),
+        }
+        if prefer and name == prefer then return row end
+        if idPrefix and not idPrefixZip
+            and name:lower():find(idPrefix, 1, true) == 1 then
+          idPrefixZip = row
+        end
+        if not anyZip then anyZip = row end
+      end
+    end
+  end
+  return idPrefixZip or anyZip
+end
+
+-- Byte-length cut that never lands mid UTF-8 codepoint.
+local function utf8Cut(s, maxBytes)
+  if type(s) ~= "string" or maxBytes <= 0 then return "" end
+  if #s <= maxBytes then return s end
+  s = s:sub(1, maxBytes)
+  -- Drop trailing continuation bytes (10xxxxxx).
+  while #s > 0 do
+    local b = s:byte(#s)
+    if b < 0x80 or b >= 0xC0 then break end
+    s = s:sub(1, #s - 1)
+  end
+  -- Drop a lead byte whose continuation was truncated away.
+  if #s > 0 then
+    local b = s:byte(#s)
+    if b >= 0xC0 then
+      s = s:sub(1, #s - 1)
+    end
+  end
+  return s
+end
+
+-- Strip common markdown / HTML noise for the launcher changelog preview.
+function ModUpdate.cleanBody(text, maxChars)
+  if type(text) ~= "string" or text == "" then return "" end
+  local s = text
+  s = s:gsub("\r\n", "\n"):gsub("\r", "\n")
+  s = s:gsub("<!%-%-.-%-%->", "")
+  s = s:gsub("<[^>]+>", "")
+  s = s:gsub("%[%!%[[^%]]*%]%([^%)]*%)%]", "") -- images ![alt](url)
+  s = s:gsub("%[([^%]]+)%]%([^%)]+%)", "%1")   -- links [text](url) -> text
+  s = s:gsub("```[^\n]*\n(.-)```", "%1")
+  s = s:gsub("`([^`]+)`", "%1")
+  s = s:gsub("^#+%s*", "", 1)
+  s = s:gsub("\n#+%s*", "\n")
+  s = s:gsub("%*%*([^*]+)%*%*", "%1")
+  s = s:gsub("%*([^*]+)%*", "%1")
+  s = s:gsub("__([^_]+)__", "%1")
+  s = s:gsub("_([^_]+)_", "%1")
+  s = s:gsub("^\n+", ""):gsub("\n+$", "")
+  s = s:gsub("\n\n\n+", "\n\n")
+  maxChars = tonumber(maxChars) or 0
+  if maxChars > 0 and #s > maxChars then
+    -- ASCII "..." (not U+2026) so later pixel ellipsize stays byte-safe.
+    s = utf8Cut(s, maxChars):gsub("%s+%S*$", "") .. "..."
+  end
+  return s
+end
+
+-- One-line preview for tight UI rows: cleaned, newlines collapsed, ellipsized.
+function ModUpdate.previewLine(text, maxChars)
+  local s = ModUpdate.cleanBody(text, 0)
+  if s == "" then return "" end
+  s = s:gsub("\n+", " "):gsub("%s+", " ")
+  s = s:match("^%s*(.-)%s*$") or s
+  maxChars = tonumber(maxChars) or 80
+  if #s > maxChars then
+    s = utf8Cut(s, maxChars):gsub("%s+%S*$", "") .. "..."
+  end
+  return s
+end
+
+-- Decode one GitHub release object into { version, tag, zip, prerelease, body }.
+function ModUpdate.parseRelease(doc, modId)
+  if type(doc) ~= "table" or not doc.tag_name then
+    return nil, "no tag_name in release"
+  end
+  local version = stripV(doc.tag_name)
+  if not version:match("^%d+%.%d+%.%d+") then
+    return nil, "release tag is not semver-like: " .. tostring(doc.tag_name)
+  end
+  local triple = version:match("^(%d+%.%d+%.%d+)")
+  local zip = ModUpdate.pickZipAsset(doc.assets, modId, triple)
+  local body = type(doc.body) == "string" and doc.body or ""
+  return {
+    version = triple,
+    tag = tostring(doc.tag_name),
+    zip = zip,
+    prerelease = doc.prerelease == true,
+    name = type(doc.name) == "string" and doc.name or triple,
+    body = body,
+  }
+end
+
+-- Decode a releases array (GET /repos/.../releases) into a sorted list
+-- (newest first). Releases without a .zip asset are dropped. Never throws.
+function ModUpdate.parseReleases(jsonText, modId, Json)
+  local ok, result, err = pcall(function()
+    Json = Json or require("src.link.Json")
+    local doc, decodeErr = Json.decode(jsonText)
+    if type(doc) ~= "table" then
+      return nil, decodeErr or "releases json is not an array"
+    end
+    if type(doc.message) == "string" and not doc.tag_name and not doc[1] then
+      return nil, "GitHub: " .. doc.message
+    end
+    if doc.tag_name then
+      local one, oneErr = ModUpdate.parseRelease(doc, modId)
+      if not one then return nil, oneErr end
+      if not one.zip then return nil, "latest release has no .zip asset" end
+      return { one }
+    end
+    local out = {}
+    for _, entry in ipairs(doc) do
+      local rel = ModUpdate.parseRelease(entry, modId)
+      if rel and rel.zip then out[#out + 1] = rel end
+    end
+    return out
+  end)
+  if not ok then return nil, "could not parse releases: " .. tostring(result) end
+  return result, err
+end
+
+function ModUpdate.apiReleasesUrl(repo)
+  return "https://api.github.com/repos/" .. repo .. "/releases?per_page=30"
+end
+
+function ModUpdate.apiLatestUrl(repo)
+  return "https://api.github.com/repos/" .. repo .. "/releases/latest"
+end
+
+function ModUpdate.isNewer(installed, candidate)
+  local Semver = require("src.mods.Semver")
+  if type(installed) ~= "string" or type(candidate) ~= "string" then
+    return false
+  end
+  local a, b = Semver.parse(installed), Semver.parse(candidate)
+  if not a or not b then return false end
+  return Semver.compare(candidate, installed) > 0
+end
+
+-- Newest non-prerelease, else newest overall.
+function ModUpdate.pickBest(releases)
+  if type(releases) ~= "table" or #releases == 0 then return nil end
+  for _, rel in ipairs(releases) do
+    if not rel.prerelease then return rel end
+  end
+  return releases[1]
+end
+
+-- ------- cache (options.modUpdateCache[repo])
+
+local function cacheStore()
+  local SaveData = require("src.core.SaveData")
+  local opts = SaveData.loadOptions()
+  opts.modUpdateCache = opts.modUpdateCache or {}
+  return opts
+end
+
+function ModUpdate.readCache(repo)
+  if type(repo) ~= "string" or repo == "" then return nil end
+  local ok, opts = pcall(function()
+    return require("src.core.SaveData").loadOptions()
+  end)
+  if not ok or type(opts) ~= "table" then return nil end
+  local entry = opts.modUpdateCache and opts.modUpdateCache[repo]
+  if type(entry) ~= "table" or type(entry.checkedAt) ~= "number" then
+    return nil
+  end
+  if type(entry.releases) ~= "table" then return nil end
+  return entry
+end
+
+function ModUpdate.cacheFresh(entry, now, ttl)
+  now = now or os.time()
+  ttl = ttl or ModUpdate.CACHE_TTL
+  return entry and type(entry.checkedAt) == "number"
+    and (now - entry.checkedAt) < ttl
+end
+
+function ModUpdate.writeCache(repo, releases)
+  if type(repo) ~= "string" or repo == "" then return false end
+  local ok = pcall(function()
+    local SaveData = require("src.core.SaveData")
+    local opts = cacheStore()
+    local best = ModUpdate.pickBest(releases)
+    -- Persist a lean copy: enough to paint the UI and reinstall without
+    -- re-fetching within the TTL.
+    local lean = {}
+    for i, rel in ipairs(releases or {}) do
+      lean[i] = {
+        version = rel.version,
+        tag = rel.tag,
+        name = rel.name,
+        prerelease = rel.prerelease == true,
+        body = type(rel.body) == "string" and rel.body or "",
+        zip = rel.zip and {
+          name = rel.zip.name,
+          url = rel.zip.url,
+          size = rel.zip.size,
+        } or nil,
+      }
+    end
+    opts.modUpdateCache[repo] = {
+      checkedAt = os.time(),
+      latest = best and best.version or nil,
+      releases = lean,
+    }
+    SaveData.saveOptions(opts)
+  end)
+  return ok
+end
+
+-- Status vs an installed version using a cache entry / release list.
+-- Returns "available" | "current" | "unknown".
+function ModUpdate.statusFor(installedVersion, releases)
+  local best = ModUpdate.pickBest(releases)
+  if not best then return "unknown", nil end
+  if ModUpdate.isNewer(installedVersion, best.version) then
+    return "available", best
+  end
+  return "current", best
+end
+
+-- ------- host I/O (curl)
+
+local function shq(s)
+  s = tostring(s)
+  if love and love.system and love.system.getOS
+      and love.system.getOS() == "Windows" then
+    return '"' .. s:gsub('"', '') .. '"'
+  end
+  return "'" .. s:gsub("'", "'\\''") .. "'"
+end
+
+local function curlCapture(url)
+  local HostShell = require("src.core.HostShell")
+  local cmd = "curl -fsSL --connect-timeout 10 --max-time 40 "
+    .. "-H " .. shq("User-Agent: gen1recomp-mod-updater") .. " "
+    .. "-H " .. shq("Accept: application/vnd.github+json") .. " "
+    .. shq(url)
+  local pipeOk, pipe = pcall(HostShell.popen, cmd)
+  if not pipeOk or not pipe then return nil, "could not run curl" end
+  local readOk, out = pcall(function() return pipe:read("*a") end)
+  pcall(function() pipe:close() end)
+  if not readOk then return nil, "curl read failed: " .. tostring(out) end
+  if not out or out == "" then return nil, "empty response from GitHub" end
+  return out
+end
+
+function ModUpdate.haveCurl()
+  local HostShell = require("src.core.HostShell")
+  local pipeOk, pipe = pcall(HostShell.popen, "curl --version")
+  if not pipeOk or not pipe then return false end
+  local readOk, out = pcall(function() return pipe:read("*a") end)
+  pcall(function() pipe:close() end)
+  return readOk and out ~= nil and out:find("curl", 1, true) ~= nil
+end
+
+-- Fetch release list. opts.force bypasses the 6h cache.
+-- Returns releases, err, meta where meta = { fromCache = bool }.
+function ModUpdate.fetchReleases(repo, modId, opts)
+  opts = opts or {}
+  if type(repo) ~= "string" or repo == "" then
+    return nil, "missing github repo"
+  end
+  if not opts.force then
+    local cached = ModUpdate.readCache(repo)
+    if ModUpdate.cacheFresh(cached) then
+      return cached.releases, nil, { fromCache = true }
+    end
+  end
+  if not ModUpdate.haveCurl() then
+    -- Stale cache is better than nothing when offline
+    local cached = ModUpdate.readCache(repo)
+    if cached and cached.releases then
+      return cached.releases, nil, { fromCache = true, stale = true }
+    end
+    return nil, "curl is not available on this platform"
+  end
+  local body, curlErr = curlCapture(ModUpdate.apiReleasesUrl(repo))
+  if not body then
+    local cached = ModUpdate.readCache(repo)
+    if cached and cached.releases then
+      return cached.releases, nil, { fromCache = true, stale = true }
+    end
+    return nil, curlErr
+  end
+  local list, parseErr = ModUpdate.parseReleases(body, modId)
+  if not list then return nil, parseErr end
+  ModUpdate.writeCache(repo, list)
+  return list, nil, { fromCache = false }
+end
+
+function ModUpdate.downloadZip(url, destName)
+  if type(url) ~= "string" or url == "" then
+    return nil, "missing download url"
+  end
+  if not (love and love.filesystem) then
+    return nil, "download needs LOVE"
+  end
+  if not ModUpdate.haveCurl() then
+    return nil, "curl is not available on this platform"
+  end
+  local HostShell = require("src.core.HostShell")
+  local name = destName or ("mod_update_" .. tostring(os.time()) .. ".zip")
+  name = tostring(name):gsub("[/\\]", "_")
+  local saveOk, saveDir = pcall(function()
+    return love.filesystem.getSaveDirectory()
+  end)
+  if not saveOk or not saveDir or saveDir == "" then
+    return nil, "no save directory"
+  end
+  local abs = saveDir .. "/" .. name
+  local cmd = "curl -fsSL --connect-timeout 15 --max-time 300 -o "
+    .. shq(abs) .. " " .. shq(url)
+  local pipeOk, pipe = pcall(HostShell.popen, cmd)
+  if not pipeOk or not pipe then return nil, "could not start download" end
+  pcall(function() pipe:read("*a") end)
+  pcall(function() pipe:close() end)
+  local infoOk, info = pcall(love.filesystem.getInfo, name)
+  if not infoOk or not info or (info.size or 0) == 0 then
+    pcall(love.filesystem.remove, name)
+    return nil, "download failed"
+  end
+  return name
+end
+
+return ModUpdate

src/mods/Schemas.lua

@@ -1186,11 +1186,13 @@ R.field = {
       nest = f.opt(f.any) },
     flyOrder = f.list(f.str),
     -- the player's own trainer art (FieldDefaults.PLAYER_PICS): the battle
-    -- back pic, the catch tutorial's old man, and the front pic the intro,
-    -- trainer card and Hall of Fame share.  Every key is optional so a
-    -- conversion can replace one pic and inherit the rest.
+    -- back pic, the catch tutorial's old man, Yellow's PROF.OAK variant of
+    -- it (#557), and the front pic the intro, trainer card and Hall of Fame
+    -- share.  Every key is optional so a conversion can replace one pic and
+    -- inherit the rest.
     playerPics = f.rec{
-      back = f.opt(f.str), demoBack = f.opt(f.str), front = f.opt(f.str) },
+      back = f.opt(f.str), demoBack = f.opt(f.str),
+      oakBack = f.opt(f.str), front = f.opt(f.str) },
     -- the new-game and boot config a total conversion replaces
     boot = f.rec{
       startMap = f.opt(f.str), startX = f.opt(f.int(0)), startY = f.opt(f.int(0)),

src/pokemon/Sprites.lua

@@ -46,20 +46,32 @@ end
 -- opts.kind: "battle" | "intro" | "trainer_card" | "hof"
 -- opts.demo: the catch tutorial, where the old man fights in the player's
 --            place and stands in for the back pic
+-- opts.oakDemo: the Yellow variant of that demo (BATTLE_TYPE_PIKACHU), where
+--            PROF.OAK fights in the player's place behind his own back pic
 -- opts.battle: the live battle, for kind == "battle"
 -- Returns path, trueColor.
 function Sprites.playerPath(data, side, opts)
   opts = opts or {}
   side = side == "back" and "back" or "front"
   -- one key per pic, so a conversion can replace the back and inherit the
-  -- rest; fieldValue folds data.field over FieldDefaults per key
+  -- rest; fieldValue folds data.field over FieldDefaults per key.  The two
+  -- demo keys mirror LoadPlayerBackPic's wBattleType branch (#557).
   local key = side == "front" and "front"
+              or (opts.oakDemo and "oakBack")
               or (opts.demo and "demoBack" or "back")
   local path = FieldDefaults.fieldValue(data, "playerPics", key)
+  -- ProfOakPicBack is a Yellow-only rip, so a cache imported before it
+  -- existed has no file there; fall back to the old man rather than hand a
+  -- missing path to getImage (#557)
+  if key == "oakBack" and path
+     and not require("src.render.Assets").exists(path) then
+    path = FieldDefaults.fieldValue(data, "playerPics", "demoBack")
+  end
   local ctx = {
     side = side,
     kind = opts.kind or "battle",
     demo = opts.demo and true or false,
+    oakDemo = opts.oakDemo and true or false,
     battle = opts.battle,
     trueColor = false,
     data = data,

src/render/PaletteFX.lua

@@ -5,11 +5,13 @@
 -- then drawn once per zone through a shader that remaps the four DMG
 -- shades to that zone's palette.
 --
--- Port display option: COLORS (OG RED / SGB / ADVANCED / OG / OG INV /
--- SGB INV / CLASSIC) transforms every zone's palette at send time via
--- effectiveColors.  ADVANCED (the `redpp` id below) swaps the named-palette
--- pack for pokered-gbc SuperPalettes (data/palettes_gbc.lua), including
--- per-species mon colors.
+-- Port display option: COLORS (OG RED / OG BLUE / OG YELLOW / SGB /
+-- ADVANCED / OG / OG INV / SGB INV / CLASSIC) transforms every zone's
+-- palette at send time via effectiveColors.  ADVANCED (the `redpp` id
+-- below) swaps the named-palette pack for pokered-gbc SuperPalettes
+-- (data/palettes_gbc.lua), including per-species mon colors.  OG YELLOW
+-- (Yellow playthrough + `ogred` id) uses pokeyellow CGBBasePalettes
+-- (data/palettes_yellow.lua / ROM cgbBase).
 
 local GameVersion = require("src.core.GameVersion")
 
@@ -17,10 +19,11 @@ local PaletteFX = {}
 
 local shader -- false = unavailable (headless / no shader support)
 local gbcPack -- false = missing; nil = not loaded yet
+local yellowPack -- false = missing; nil = not loaded yet
 
 -- Cycle order matches OptionsMenu / hotkey 2.  The three real colorizations
--- come first (OG RED = GBC hardware, SGB = per-map Super Game Boy, ADVANCED =
--- pokered-gbc per-tile), then the DMG-shade novelty modes.
+-- come first (OG RED/BLUE/YELLOW = GBC hardware, SGB = per-map Super Game Boy,
+-- ADVANCED = pokered-gbc per-tile), then the DMG-shade novelty modes.
 PaletteFX.MODES = { "ogred", "gbc", "redpp", "og", "og_inv", "gbc_inv", "classic" }
 -- `gbc`/`gbc_inv`/`redpp` keep their save-value ids for back-compat while
 -- their LABELS say what the mode actually is: "SGB"/"SGB INV" because the old
@@ -117,14 +120,19 @@ PaletteFX.GBC_OBJ_BLUE = {
 }
 
 -- The active game's OG boot-ROM background palette: blue for a Blue
--- playthrough, red otherwise.  White (index 1) and black (index 4) are
--- identical across versions, so callers that only touch the endpoints
--- (e.g. BattleState's zone white/black snap) need no version branch.
--- Yellow is CGB-enhanced (pokeyellow CGBBasePalettes) and has no extracted
--- boot-ROM auto-palette here; keep the Red ramp -- never Blue's GBC_BG_BLUE.
+-- playthrough, red for Red.  White (index 1) and black (index 4) are
+-- identical across Red/Blue, so callers that only touch the endpoints
+-- (e.g. BattleState's zone white/black snap) need no version branch there.
+-- Yellow is CGB-enhanced (pokeyellow CGBBasePalettes): named zones go through
+-- pal() / usesYellowCgb(), and ogBg() falls back to CGBBase PAL_ROUTE for any
+-- remaining whole-screen callers -- never Blue's GBC_BG_BLUE.
 function PaletteFX.ogBg()
   if GameVersion.isBlue() then return PaletteFX.GBC_BG_BLUE end
-  if GameVersion.isYellow() then return PaletteFX.GBC_BG end
+  if GameVersion.isYellow() then
+    local y = PaletteFX.yellowPack()
+    local route = y and y.cgbBase and y.cgbBase.ROUTE
+    if route then return route end
+  end
   return PaletteFX.GBC_BG
 end
 
@@ -133,14 +141,12 @@ end
 -- version-distinct cache-group string, because SpriteRenderer.getObpImage keys
 -- its baked-image cache by (image path, group): a shared group would collide a
 -- Red bake with a Blue one and one version would show the other's colors.
--- Yellow: same Red OBJ green as above until Yellow-specific tables land.
+-- Yellow OG does not bake a boot-ROM OBJ (usesSpriteObp is false); this path
+-- is unused there and kept as Red green only as a safe leftover.
 function PaletteFX.ogObj()
   if GameVersion.isBlue() then
     return PaletteFX.darkObp(PaletteFX.GBC_OBJ_BLUE, "gbcobj_blue")
   end
-  if GameVersion.isYellow() then
-    return PaletteFX.darkObp(PaletteFX.GBC_OBJ, "gbcobj")
-  end
   return PaletteFX.darkObp(PaletteFX.GBC_OBJ, "gbcobj")
 end
 
@@ -271,13 +277,31 @@ function PaletteFX.gbcPack()
   return gbcPack or nil
 end
 
+-- pokeyellow SuperPalettes + CGBBasePalettes (committed; not wiped by import).
+-- ROM import may also stamp palettes.cgbBase; yellowCgbNamedPal prefers that.
+function PaletteFX.yellowPack()
+  if yellowPack == nil then
+    local ok, pack = pcall(require, "data.palettes_yellow")
+    yellowPack = ok and pack or false
+  end
+  return yellowPack or nil
+end
+
 function PaletteFX.usesGbcPack(mode)
   mode = mode or PaletteFX.mode
   return mode == "redpp"
 end
 
+-- Yellow's authentic GBC look is CGBBasePalettes (per-map), not a boot-ROM
+-- auto-palette.  The shared `ogred` save id wears that table on a Yellow
+-- playthrough and labels itself "OG YELLOW".
+function PaletteFX.usesYellowCgb(mode)
+  mode = mode or PaletteFX.mode
+  return GameVersion.isYellow() and mode == "ogred"
+end
+
 -- Whether the active mode bakes a per-OBJ palette onto overworld sprites
--- (the OBP bake + post-zone redraw path).  OG RED alone does: the Game Boy
+-- (the OBP bake + post-zone redraw path).  OG RED / OG BLUE do: the Game Boy
 -- Color boot ROM hands the game one global object palette (PaletteFX.ogObj --
 -- green over Red's red background, pink over Blue's blue background), so on
 -- that machine the player and NPCs carry a fixed object color instead of
@@ -288,6 +312,10 @@ end
 -- regression.  Terrain is unaffected -- pal() below still hands SGB its per-map
 -- BG palette; only OG RED short-circuits BG to the one global red palette.
 --
+-- OG YELLOW does NOT.  Yellow ships CGB code and colors regions via
+-- CGBBasePalettes the same way SGB mode colors SuperPalettes, so sprites tint
+-- with the map zone (usesSpriteObp stays off).
+--
 -- SGB does NOT.  The Super Game Boy colorizes the composited DMG picture it is
 -- handed and cannot tell an OBJ pixel from a BG one; pokered never sends the
 -- OBJ_TRN packet that would enable SGB sprite mode (data/sgb/sgb_packets.asm
@@ -306,7 +334,7 @@ end
 -- usesGbcPack() path in SpriteRenderer instead.
 function PaletteFX.usesSpriteObp(mode)
   mode = mode or PaletteFX.mode
-  return mode == "ogred"
+  return mode == "ogred" and not GameVersion.isYellow()
 end
 
 -- ------- post-zone sprite redraw (OG RED)
@@ -363,8 +391,8 @@ end
 -- read these from the ROM-imported table or the title ribbon stays red
 -- and the Game Corner reels keep Red's pink (issue #128).
 -- Yellow is intentionally NOT in BLUE_VERSIONED: skip Blue LOGO1/SLOTS*
--- recolors.  When CGBBasePalettes were imported (palettes.cgbBase), Yellow
--- prefers those over SGB SuperPalettes for named zones.
+-- recolors.  OG YELLOW (usesYellowCgb) reads CGBBasePalettes; SGB mode on
+-- Yellow keeps SuperPalettes.
 local BLUE_VERSIONED = {
   LOGO1 = true, SLOTS2 = true, SLOTS3 = true, SLOTS4 = true,
 }
@@ -376,31 +404,42 @@ end
 
 local function yellowCgbNamedPal(data, name)
   local p = data and data.palettes
-  return p and p.cgbBase and p.cgbBase[name]
+  local fromRom = p and p.cgbBase and p.cgbBase[name]
+  if fromRom then return fromRom end
+  local y = PaletteFX.yellowPack()
+  return y and y.cgbBase and y.cgbBase[name] or nil
 end
 
 -- named palette from the active pack (nil on stale builds / missing name).
 -- RED++ falls back to the ROM pack for names the gbc table omits (rare).
--- OG RED short-circuits EVERY name to the one global GBC boot-ROM BG palette
--- (the hardware had a single BGP for the whole game), so terrain zones,
--- battle HP bars / text, and menu boxes all come out red -- everything a
--- background tile drew.  Objects do not come through here (they bake
--- GBC_OBJ green), so this stays a BG-only hook.
+-- OG RED / OG BLUE short-circuit EVERY name to the one global GBC boot-ROM
+-- BG palette (the hardware had a single BGP for the whole game), so terrain
+-- zones, battle HP bars / text, and menu boxes all come out red/blue --
+-- everything a background tile drew.  Objects do not come through here
+-- (they bake GBC_OBJ), so this stays a BG-only hook.
+-- OG YELLOW instead resolves each name through CGBBasePalettes.
 function PaletteFX.pal(data, name)
-  if PaletteFX.mode == "ogred" then return PaletteFX.ogBg() end
+  if PaletteFX.mode == "ogred" and not GameVersion.isYellow() then
+    return PaletteFX.ogBg()
+  end
   -- Blue-only ROM override for versioned SuperPals.  Yellow (isYellow) and
   -- Red keep the active pack / Red-like path -- do not apply Blue recolors.
   if GameVersion.isBlue() and BLUE_VERSIONED[name] then
     local fromRom = romNamedPal(data, name)
     if fromRom then return fromRom end
   end
-  if GameVersion.isYellow() then
+  if PaletteFX.usesYellowCgb() then
     local fromCgb = yellowCgbNamedPal(data, name)
     if fromCgb then return fromCgb end
   end
   local p = PaletteFX.pack(data)
   local c = p and p.palettes[name]
   if c then return c end
+  if GameVersion.isYellow() then
+    local y = PaletteFX.yellowPack()
+    local yc = y and y.palettes and y.palettes[name]
+    if yc then return yc end
+  end
   if PaletteFX.usesGbcPack() then
     return romNamedPal(data, name)
   end
@@ -413,14 +452,20 @@ end
 -- Transformed mon's pic is tinted gray, not the copied species' own
 -- SGB color).  RED++ uses per-species pals from mon_palettes.asm.
 function PaletteFX.monPal(data, species, transformed)
-  -- OG RED: a battle mon pic is a BG tile on the Game Boy Color (drawn into
-  -- the tilemap, colored by BGP), so it wears the global red BG palette, not
-  -- a per-species one -- matching the hardware capture where both mons are
-  -- red/pink on the white field.
-  if PaletteFX.mode == "ogred" then return PaletteFX.ogBg() end
+  -- OG RED / OG BLUE: a battle mon pic is a BG tile on the Game Boy Color
+  -- (drawn into the tilemap, colored by BGP), so it wears the global boot-ROM
+  -- BG palette, not a per-species one -- matching the hardware capture where
+  -- both mons are red/pink (or blue/pink) on the white field.
+  -- OG YELLOW keeps per-species CGBBasePalettes (Yellow had real CGB code).
+  if PaletteFX.mode == "ogred" and not GameVersion.isYellow() then
+    return PaletteFX.ogBg()
+  end
   local p = PaletteFX.pack(data)
   if not p then return nil end
   if transformed then
+    if PaletteFX.usesYellowCgb() then
+      return PaletteFX.pal(data, "GRAYMON")
+    end
     return p.palettes.GRAYMON
         or (data and data.palettes and data.palettes.palettes.GRAYMON)
   end
@@ -430,17 +475,32 @@ function PaletteFX.monPal(data, species, transformed)
   -- so fall back to it when the pack itself doesn't carry the name.
   local def = data and data.pokemon and data.pokemon[species]
   if def and def.palette then
+    if PaletteFX.usesYellowCgb() then
+      local yc = PaletteFX.pal(data, def.palette)
+      if yc then return yc end
+    end
     local pal = p.palettes[def.palette]
              or (data and data.palettes and data.palettes.palettes[def.palette])
     if pal then return pal end
   end
   local name = p.pokemon[species] or "MEWMON"
+  if PaletteFX.usesYellowCgb() then
+    local yc = PaletteFX.pal(data, name)
+    if yc then return yc end
+  end
   local c = p.palettes[name]
   if c then return c end
   if PaletteFX.usesGbcPack() and data and data.palettes then
     name = data.palettes.pokemon[species] or "MEWMON"
     return data.palettes.palettes[name]
   end
+  if GameVersion.isYellow() then
+    local y = PaletteFX.yellowPack()
+    if y and y.pokemon then
+      name = y.pokemon[species] or "MEWMON"
+      return y.palettes and y.palettes[name]
+    end
+  end
   return nil
 end
 
@@ -707,12 +767,10 @@ end
 
 function PaletteFX.modeLabel(mode)
   mode = mode or PaletteFX.mode
-  -- The GBC boot-ROM mode wears the running game's name: it is red for Red and
-  -- blue for Blue (see ogBg), so a Blue playthrough shows "OG BLUE".
-  -- Yellow still uses the Red boot-ROM ramp (no Yellow table yet), so keep
-  -- the "OG RED" label rather than inventing an "OG YELLOW" without colors.
+  -- The GBC hardware mode wears the running game's name: OG RED / OG BLUE
+  -- (boot-ROM auto-palette) or OG YELLOW (pokeyellow CGBBasePalettes).
   if mode == "ogred" and GameVersion.isBlue() then return "OG BLUE" end
-  if mode == "ogred" and GameVersion.isYellow() then return "OG RED" end
+  if mode == "ogred" and GameVersion.isYellow() then return "OG YELLOW" end
   return PaletteFX.MODE_LABELS[mode] or "GBC"
 end
 

src/render/Renderer.lua

@@ -474,6 +474,41 @@ local function withTrueColor(zoneList, pass)
   return merged
 end
 
+-- Palette-correct blit of `canvas` at (sx, sy) LOVE-unit scales into origin
+-- (bx, by), scissored to the (boxX, boxY, boxW, boxH) screen rect.  zoneSx/
+-- zoneSy convert zone coords (canvas-space) into screen units.  Public so a
+-- render.compose mod can composite the world/UI canvases into its own layout.
+function Renderer:blitCanvas(canvas, sx, sy, zoneList, zoneSx, zoneSy,
+                             bx, by, boxX, boxY, boxW, boxH, dpiX, dpiY)
+  local shader = zoneList and zoneList[1] and PaletteFX.shader() or nil
+  if not shader then
+    love.graphics.setScissor(boxX, boxY, boxW, boxH)
+    love.graphics.draw(canvas, bx, by, 0, sx, sy)
+    love.graphics.setScissor()
+    return
+  end
+  love.graphics.setShader(shader)
+  -- a colors == false zone is the trueColor opt-out: its rect draws with
+  -- no shader at all.  Nothing sets one without a mod, so a vanilla zone
+  -- list never toggles and issues exactly the calls it always did.
+  local bare = false
+  for _, z in ipairs(zoneList) do
+    local plain = z.colors == false
+    if plain ~= bare then
+      bare = plain
+      love.graphics.setShader(not plain and shader or nil)
+    end
+    if not plain then PaletteFX.sendColors(shader, z.colors) end
+    if scissorClamped(bx + z.x * zoneSx, by + z.y * zoneSy,
+                      z.w * zoneSx, z.h * zoneSy,
+                      boxX, boxY, boxW, boxH, dpiX, dpiY) then
+      love.graphics.draw(canvas, bx, by, 0, sx, sy)
+    end
+  end
+  love.graphics.setScissor()
+  love.graphics.setShader()
+end
+
 -- zones: optional list of SGB palette regions (see PaletteFX) in
 -- 160x144 UI space, applied to the UI pass.  worldZones: optional
 -- regions in world-canvas pixels (overworld survey zoom colors each
@@ -506,6 +541,36 @@ function Renderer:endFrame(zones, worldZones)
   zones = withTrueColor(zones, "ui")
   worldZones = withTrueColor(worldZones, "world")
 
+  -- render.compose: hand a mod the finished world + UI canvases (and their
+  -- SGB zones), the frame metrics, Renderer:blitCanvas and the SecondScreen
+  -- bridge, letting it lay the two passes out however it likes -- e.g. as two
+  -- stacked Game Boy screens, or driving one onto a second physical display.
+  -- The mod returns true to take over the whole window; anything else (or no
+  -- mod wrapping the hook) falls through to the normal composite below.
+  if Runtime.wantsHook("render.compose") then
+    local ctx = {
+      renderer = self,
+      worldCanvas = self.worldCanvas, uiCanvas = self.canvas,
+      worldOverride = self.worldOverride,
+      worldActive = self.worldActive and true or false,
+      zones = zones, worldZones = worldZones,
+      ww = ww, wh = wh, pw = pw, ph = ph, ox = ox, oy = oy,
+      vpw = vpw, vph = vph, uiw = uiw, uih = uih,
+      scale = Sp, Sx = Sx, Sy = Sy, dpiX = dpiX, dpiY = dpiY,
+      secondScreen = require("src.render.SecondScreen"),
+    }
+    if Runtime.call("render.compose", function() return false end, self, ctx) == true then
+      self.worldActive = false
+      self.uprightActive = false
+      self.worldOverride = nil
+      PaletteFX.setPass(nil)
+      return {
+        width = ww, height = wh, gameX = ox, gameY = oy,
+        gameWidth = vpw, gameHeight = vph, scale = Sp, dpiX = dpiX, dpiY = dpiY,
+      }
+    end
+  end
+
   -- A post-process pipeline needs the whole composite in a canvas for the
   -- same reason GBC FX does, so either one alone is enough to take the
   -- present path; with neither, the frame draws straight to the screen
@@ -560,38 +625,12 @@ function Renderer:endFrame(zones, worldZones)
     })
   end
 
-  -- blit `canvas` at (sx, sy) LOVE-unit scales into origin (bx, by),
-  -- scissored to the (boxX, boxY, boxW, boxH) screen rect.  zoneSx/zoneSy
-  -- convert zone coords (canvas-space) into screen units.
+  -- see Renderer:blitCanvas; bound here to the frame's dpi so the composite
+  -- call sites below stay unchanged.
   local function blit(canvas, sx, sy, zoneList, zoneSx, zoneSy,
                       bx, by, boxX, boxY, boxW, boxH)
-    local shader = zoneList and zoneList[1] and PaletteFX.shader() or nil
-    if not shader then
-      love.graphics.setScissor(boxX, boxY, boxW, boxH)
-      love.graphics.draw(canvas, bx, by, 0, sx, sy)
-      love.graphics.setScissor()
-      return
-    end
-    love.graphics.setShader(shader)
-    -- a colors == false zone is the trueColor opt-out: its rect draws with
-    -- no shader at all.  Nothing sets one without a mod, so a vanilla zone
-    -- list never toggles and issues exactly the calls it always did.
-    local bare = false
-    for _, z in ipairs(zoneList) do
-      local plain = z.colors == false
-      if plain ~= bare then
-        bare = plain
-        love.graphics.setShader(not plain and shader or nil)
-      end
-      if not plain then PaletteFX.sendColors(shader, z.colors) end
-      if scissorClamped(bx + z.x * zoneSx, by + z.y * zoneSy,
-                        z.w * zoneSx, z.h * zoneSy,
-                        boxX, boxY, boxW, boxH, dpiX, dpiY) then
-        love.graphics.draw(canvas, bx, by, 0, sx, sy)
-      end
-    end
-    love.graphics.setScissor()
-    love.graphics.setShader()
+    return self:blitCanvas(canvas, sx, sy, zoneList, zoneSx, zoneSy,
+                           bx, by, boxX, boxY, boxW, boxH, dpiX, dpiY)
   end
 
   if self.worldOverride then
@@ -720,6 +759,13 @@ function Renderer:endFrame(zones, worldZones)
   self.uprightActive = false
   self.worldOverride = nil
   PaletteFX.setPass(nil)
+  return {
+    width = ww, height = wh,
+    gameX = ox, gameY = oy,
+    gameWidth = vpw, gameHeight = vph,
+    scale = Sp,
+    dpiX = dpiX, dpiY = dpiY,
+  }
 end
 
 return Renderer

src/render/SecondScreen.lua

@@ -0,0 +1,59 @@
+-- Bridge to native secondary-display output (Android Presentation). The C
+-- functions live in mobile/android/love/src/jni/love/src/common/android.cpp.
+-- Everything is guarded: off Android, or if the symbols cannot be resolved,
+-- this stays inert and the renderer keeps the in-window stacked layout.
+
+local SecondScreen = {}
+local C = nil
+
+local function log(msg)
+  pcall(function() require("src.core.Logger").info("SecondScreen: %s", msg) end)
+end
+
+do
+  local ok, ffi = pcall(require, "ffi")
+  if not (ok and ffi) then
+    log("ffi unavailable (not LuaJIT); second display disabled")
+  else
+    pcall(ffi.cdef, [[
+      int love_android_secondary_ready();
+      void love_android_push_secondary(const void *rgba, int w, int h);
+      void love_android_secondary_enable(int on);
+    ]])
+    local okLib, lib = pcall(ffi.load, "love")
+    if okLib and lib and pcall(function() return lib.love_android_secondary_ready end) then
+      C = lib
+      log("bridge linked via ffi.load('love')")
+    elseif pcall(function() return ffi.C.love_android_secondary_ready end) then
+      C = ffi.C
+      log("bridge linked via default namespace")
+    else
+      log(("bridge symbols not found (ffi.load ok=%s); second display disabled")
+        :format(tostring(okLib)))
+    end
+  end
+end
+
+function SecondScreen.usable()
+  return C ~= nil
+end
+
+function SecondScreen.available()
+  if not C then return false end
+  local ok, r = pcall(C.love_android_secondary_ready)
+  return ok and r ~= 0
+end
+
+function SecondScreen.push(imageData, w, h)
+  if not C or not imageData then return false end
+  return pcall(function()
+    C.love_android_push_secondary(imageData:getFFIPointer(), w, h)
+  end)
+end
+
+function SecondScreen.setEnabled(on)
+  if not C then return end
+  pcall(function() C.love_android_secondary_enable(on and 1 or 0) end)
+end
+
+return SecondScreen

src/render/Zoom.lua

@@ -10,6 +10,13 @@ local Zoom = {}
 
 Zoom.offset = 0
 
+-- Survey zoom (zooming out past FIT, which renders connected neighbor maps)
+-- is the port's most expensive optional extra.  The performance tier sets
+-- this false on LOW hardware (Game:applyOptions); offsetRange then floors
+-- the range at FIT so the option row, hotkey, and mouse wheel all stop at
+-- close-up.  Nil/true keeps the historical full range.
+Zoom.allowSurvey = true
+
 -- legal offset range for a given fit scale (vanilla: survey at 1 px/world
 -- through 2× fit).  zoom.range may widen or shrink the window.
 function Zoom.offsetRange(S)
@@ -21,6 +28,9 @@ function Zoom.offsetRange(S)
     hi = math.floor(tonumber(hi) or S)
     if lo > hi then lo, hi = hi, lo end
   end
+  -- LOW performance tier: no survey (negative offsets), even if a mod's
+  -- zoom.range widened it.  == false so nil/true stays permissive.
+  if Zoom.allowSurvey == false and lo < 0 then lo = 0 end
   return lo, hi
 end
 

src/script/Commands.lua

@@ -210,11 +210,12 @@ end
 -- text (label or literal; {RAM:wStringBuffer} becomes the item name);
 -- pass false when the script shows its own received-text row.
 function Commands.give_item(ctx, itemId, count, gotText)
-  -- the 20-slot bag can refuse (BAG_ITEM_CAPACITY): say so and halt
+  -- the bag can refuse at its configured capacity (20 in vanilla): halt
   -- the script, so later set_flag rows don't burn the gift -- make
   -- room and talk again, like the original (pokered's `jr nc, .bag_full`
   -- skips the received text entirely when AddItemToInventory refuses)
-  if not require("src.inventory.Bag").add(ctx.save, itemId, count or 1) then
+  if not require("src.inventory.Bag").add(
+      ctx.save, itemId, count or 1, ctx.game.data) then
     Commands.show_text(ctx, ctx.game.data.text
       and ctx.game.data.text._BagFullText or Strings("You can't carry\nany more items!"))
     return math.huge
@@ -265,7 +266,18 @@ function Commands.start_battle(ctx, kind, a, b)
     ctx.lastBattleResult = result
     ctx.lastCheck = result == "win"
     if ctx.overworld then
-      ctx.overworld:afterBattle(result, battle)
+      -- A map script often follows a trainer battle with its own text.
+      -- Keep a level evolution behind that text: otherwise afterBattle
+      -- pushes the evolution screen, then this runner resumes and pushes
+      -- the trainer's text on top of it.
+      if result == "win" then
+        ctx.afterScript = ctx.afterScript or {}
+        table.insert(ctx.afterScript, function()
+          ctx.overworld:afterBattle(result, battle)
+        end)
+      else
+        ctx.overworld:afterBattle(result, battle)
+      end
     end
     runner:resume()
   end
@@ -723,11 +735,15 @@ function Commands.record_hall_of_fame(ctx)
       if game.overworld then
         game.overworld.lastOutdoor = ctx.save.lastOutdoor
       end
-      if game.writeSave then game:writeSave() end
+      local saveAllowed = true
+      if game.writeSave then saveAllowed = game:writeSave() ~= false end
       -- writeSave's captureSave re-stamps the live HALL_OF_FAME coords;
       -- re-apply home and persist so CONTINUE resumes in the bedroom.
       SaveData.applyPostGameHome(ctx.save, boot)
-      SaveData.save(ctx.save)
+      -- A tool session may veto Game:writeSave to keep its in-memory run
+      -- isolated from the player's real save.  The relocation write is part
+      -- of that same save operation and must honor the same decision.
+      if saveAllowed then SaveData.save(ctx.save) end
     end)
   end)
   runner:yield()

src/script/ScriptRunner.lua

@@ -125,6 +125,10 @@ function ScriptRunner:run(script, extra)
   end
   self.co = coroutine.create(function()
     self:exec(script, ctx)
+    -- Commands can defer a game action until the script's own dialogue is
+    -- done. start_battle uses this for win-path evolutions, which must not
+    -- be covered by post-battle trainer text.
+    for _, callback in ipairs(ctx.afterScript or {}) do callback() end
     if ctx.onDone then ctx.onDone() end
     if Runtime.wants("script.ended") then
       Runtime.emit("script.ended", { ctx = ctx, completed = true })

src/ui/BagMenu.lua

@@ -93,6 +93,17 @@ local function useOn(game, battle, id, target, list, moveIndex, picker)
   end
 
   if result == "bicycle" then
+    -- StartMenu_Item .useOrTossItem (engine/menus/start_sub_menus.asm):
+    -- while BIT_ALWAYS_ON_BIKE of wStatusFlags6 is set -- the Cycling Road,
+    -- armed by the forced-bike tiles and cleared by the Route 16/18 gate
+    -- scripts -- the BICYCLE refuses with _CannotGetOffHereText and jumps
+    -- back to ItemMenuLoop, so the bag stays open and no dismount happens
+    -- (#513).  The gate sits ahead of UseItem, before ItemUseBicycle ever
+    -- runs, which is why it precedes list:close() here.
+    if game.save.forcedBike then
+      showMessages(game, { Strings("You can't get off\nhere.") })
+      return
+    end
     list:close()
     local ow = game.overworld
     local Music = require("src.core.Music")

src/ui/BindingsMenu.lua

@@ -64,9 +64,24 @@ function BindingsMenu.new(game)
   local self = setmetatable(ListMenu.new(game, "CONTROLS", items, {}),
                             BindingsMenu)
   self.onChoose = function(item) self:beginCapture(item) end
+  -- A rebind reaches Input only when this screen closes (#510).  The menu
+  -- steers by the live map, so applying "B = Z" the instant it was captured
+  -- turned the player's next confirm press into a cancel and shut the
+  -- screen mid-swap.  options.bindings is still written immediately, and
+  -- Game:applyOptions re-applies it on load, so a close that skips this
+  -- hook still ends up with the saved map.
+  self.onCancel = function() self:commitBindings() end
   return self
 end
 
+-- Cross-file contract with src/core/Input.lua: the saved overlay reaches
+-- the live map here, on close, and nowhere else in this screen.
+function BindingsMenu:commitBindings()
+  local game = self.game
+  local opts = game and game.save and game.save.options
+  if opts then Input:applyBindings(opts.bindings) end
+end
+
 -- the capture handlers are per-instance slots, so Game's raw-input
 -- routing only ever sees this screen while a capture is armed
 function BindingsMenu:beginCapture(item)
@@ -75,7 +90,12 @@ function BindingsMenu:beginCapture(item)
   self.onGamepadPressed = BindingsMenu.capturePad
 end
 
+-- Escape is the capture's way out, so it is never captured: every other
+-- key is bindable, which otherwise leaves an armed row with no exit but
+-- to bind something (#510).  Escape stays START in Input's default map,
+-- which no rebind removes, so reserving it costs the player nothing.
 function BindingsMenu:captureKey(key)
+  if key == "escape" then return self:storeBinding("key", nil) end
   self:storeBinding("key", key)
 end
 
@@ -100,7 +120,6 @@ function BindingsMenu:storeBinding(slot, value)
   b[slot] = value
   opts.bindings[item.button.id] = b
   item.right = boundRight(opts.bindings, item.button)
-  Input:applyBindings(opts.bindings)
   if game.writeOptions then game:writeOptions() end
 end
 
@@ -112,9 +131,10 @@ end
 function BindingsMenu:draw()
   ListMenu.draw(self)
   if self.capture then
-    Font.drawBox(1, 6, 18, 4)
+    Font.drawBox(1, 6, 18, 5)
     love.graphics.setColor(0, 0, 0, 1)
     Font.draw(Strings("PRESS A BUTTON"), 24, 60)
+    Font.draw(Strings("ESC TO CANCEL"), 24, 72)
     love.graphics.setColor(1, 1, 1, 1)
   end
 end

src/ui/BoxMenu.lua

@@ -66,6 +66,7 @@ local function withdraw(game)
   end
   game.stack:push(ListMenu.new(game,
     Strings("BOX %d (WITHDRAW)", game.save.currentBox), items, {
+    noSound = true, -- PCMainMenu holds BIT_NO_MENU_BUTTON_SOUND (#570)
     onChoose = function(item, list)
       local mon = box[item.value]
       if not mon then return end
@@ -112,6 +113,7 @@ local function deposit(game)
     table.insert(items, { label = monLabel(game, mon), value = i })
   end
   game.stack:push(ListMenu.new(game, "PARTY (DEPOSIT)", items, {
+    noSound = true, -- PCMainMenu holds BIT_NO_MENU_BUTTON_SOUND (#570)
     onChoose = function(item, list)
       local mon = game.save.party[item.value]
       if not mon then return end
@@ -157,6 +159,7 @@ local function release(game)
   end
   game.stack:push(ListMenu.new(game,
     Strings("BOX %d (RELEASE)", game.save.currentBox), items, {
+    noSound = true, -- PCMainMenu holds BIT_NO_MENU_BUTTON_SOUND (#570)
     onChoose = function(_, list)
       local mon = box[list.index]
       if not mon then return end
@@ -189,6 +192,7 @@ local function changeBox(game)
     })
   end
   game.stack:push(ListMenu.new(game, "CHANGE BOX", items, {
+    noSound = true, -- PCMainMenu holds BIT_NO_MENU_BUTTON_SOUND (#570)
     onChoose = function(item, list)
       -- the original asks BEFORE switching ("When you change a #MON
       -- BOX, data will be saved. OK?"); declining aborts the change

src/ui/EvolutionState.lua

@@ -48,11 +48,11 @@ end
 local FLASH_FRAMES = 220
 
 local function frontSprite(game, species, mon)
-  local path = require("src.pokemon.Sprites").path(game.data, species, "front",
-    { mon = mon, kind = "evolution" })
-  if not path then return nil end
+  local path, trueColor = require("src.pokemon.Sprites").path(
+    game.data, species, "front", { mon = mon, kind = "evolution" })
+  if not path then return nil, false end
   local ok, img = pcall(love.graphics.newImage, path)
-  return ok and img or nil
+  return ok and img or nil, ok and trueColor or false
 end
 
 function EvolutionState.new(game, mon, newSpecies, onDone, via)
@@ -69,8 +69,8 @@ function EvolutionState.new(game, mon, newSpecies, onDone, via)
   -- wForceEvolution clear and so honour B (#290, #213).
   self.cancelable = (via ~= "TRADE" and via ~= "ITEM")
   self.oldName = mon.nickname or game.data.pokemon[mon.species].name
-  self.oldSprite = frontSprite(game, mon.species, mon)
-  self.newSprite = frontSprite(game, newSpecies, mon)
+  self.oldSprite, self.oldSpriteTrueColor = frontSprite(game, mon.species, mon)
+  self.newSprite, self.newSpriteTrueColor = frontSprite(game, newSpecies, mon)
   self.t = 0
   self.done = false
   self.canceled = false
@@ -127,18 +127,30 @@ function EvolutionState:draw()
   love.graphics.rectangle("fill", 0, 0, 160, 144)
 
   -- accelerating flash between the two forms
-  local sprite
+  local sprite, spriteTrueColor
   if self.done then
     -- a cancelled evolution settles back on the original form
-    sprite = self.canceled and self.oldSprite or self.newSprite
+    if self.canceled then
+      sprite, spriteTrueColor = self.oldSprite, self.oldSpriteTrueColor
+    else
+      sprite, spriteTrueColor = self.newSprite, self.newSpriteTrueColor
+    end
   else
     local period = math.max(4, 28 - math.floor(self.t / 40) * 6)
     local showNew = math.floor(self.t / period) % 2 == 1
-    sprite = showNew and self.newSprite or self.oldSprite
+    if showNew then
+      sprite, spriteTrueColor = self.newSprite, self.newSpriteTrueColor
+    else
+      sprite, spriteTrueColor = self.oldSprite, self.oldSpriteTrueColor
+    end
   end
   if sprite then
-    love.graphics.draw(sprite, math.floor((160 - sprite:getWidth()) / 2),
-                       math.max(8, 64 - sprite:getHeight()))
+    local x = math.floor((160 - sprite:getWidth()) / 2)
+    local y = math.max(8, 64 - sprite:getHeight())
+    love.graphics.draw(sprite, x, y)
+    if spriteTrueColor then
+      require("src.render.PaletteFX").markTrueColor(x, y, sprite:getDimensions())
+    end
   end
 
   love.graphics.setColor(0, 0, 0, 1)

src/ui/ListMenu.lua

@@ -78,6 +78,10 @@ function ListMenu.new(game, title, items, opts)
   -- bottom text box -- same row budget as the mart, without the money box.
   self.messageBox = opts.messageBox
   self.money = opts.money          -- () -> current money for the box
+  -- BIT_NO_MENU_BUTTON_SOUND (wMiscFlags): both PC sessions hold the flag
+  -- for their whole run (engine/menus/pc.asm, engine/menus/players_pc.asm),
+  -- so their lists opt out of the A/B beep the same way Menu's noSound does
+  self.noSound = opts.noSound or false
   self.rows = opts.rows or ((opts.dialogue or opts.messageBox) and 4 or ROWS)
   return self
 end
@@ -101,6 +105,17 @@ local function syncScroll(self)
   if self.index - self.scroll < 1 then self.scroll = self.index - 1 end
 end
 
+-- HandleMenuInput_ (home/window.asm) replays SFX_PRESS_AB for any watched
+-- A or B press; DisplayListMenuID's mask is PAD_A | PAD_B | PAD_SELECT
+-- (home/list_menu.asm), so the SELECT swap key stays silent (#570)
+local function beep(self)
+  -- game.data is nil under the UI harnesses that drive a list with a stub
+  -- game (tests/engine/rebind_capture_bug510.lua), where there is no audio
+  -- cache to play out of
+  if self.noSound or not (self.game and self.game.data) then return end
+  require("src.core.Sound").play(self.game.data, "Press_AB")
+end
+
 -- edge press or key-repeat tick for a held direction
 local function navPressed(self, dir)
   if dir == "up" then
@@ -126,6 +141,7 @@ function ListMenu:update(dt)
   local input = self.game.input
   if #self.items == 0 then
     if input:wasPressed("a") or input:wasPressed("b") then
+      beep(self)
       self.game.stack:pop()
       if self.onCancel then self.onCancel() end
     end
@@ -148,10 +164,12 @@ function ListMenu:update(dt)
   elseif self.onSelectKey and input:wasPressed("select") then
     self.onSelectKey(self.items[self.index], self)
   elseif input:wasPressed("b") then
+    beep(self)
     self.game.stack:pop()
     if self.onCancel then self.onCancel() end
     return
   elseif input:wasPressed("a") then
+    beep(self)
     local item = self.items[self.index]
     if self.onChoose then
       self.onChoose(item, self)

src/ui/Menu.lua

@@ -108,20 +108,34 @@ function Menu:draw()
   love.graphics.setColor(0, 0, 0, 1)
   local visible = (self.maxVisible and math.min(self.maxVisible, #self.items))
     or #self.items
+  -- Row Y: pokered's boxed menus anchor the choices to the BOTTOM interior
+  -- row and let any slack fall as a blank row under the top edge --
+  -- draw_start_menu.asm (TextBoxBorder 10,0, then hlcoord 12,2 /
+  -- wTopMenuItemY 2), players_pc.asm and bills_pc.asm all do the same.  The
+  -- bottom border is ty + th - 1, so the last choice sits on ty + th - 2 and
+  -- row r counts back up from there.  Anchoring from the top instead only
+  -- agrees when th is exactly visible * rowStep + 2, which is Menu.new's
+  -- default but NOT what a caller sizing its own box passes: BagMenu's
+  -- USE/TOSS is th = 5 for two choices (#284, matching text_boxes.asm's
+  -- USE_TOSS_MENU_TEMPLATE rows 10..14), and a top anchor pushed TOSS onto
+  -- the bottom border (#564, #572).
   for row = 1, visible do
     local item = self.items[self.scroll + row]
     if not item then break end
     Font.draw(item.label, (self.tx + 2) * 8,
-      (self.ty + row * self.rowStep - (self.rowStep - 1)) * 8)
+      (self.ty + self.th - 2 - (visible - row) * self.rowStep) * 8)
   end
   local cursorRow = self.index - self.scroll
   Font.drawCode(Theme.cursor, (self.tx + 1) * 8,
-    (self.ty + cursorRow * self.rowStep - (self.rowStep - 1)) * 8)
+    (self.ty + self.th - 2 - (visible - cursorRow) * self.rowStep) * 8)
   -- moreArrow ($EE): the same "more below" glyph OptionRows/ManagerState
-  -- use, sat on the bottom border like TextBox's page-advance cursor
+  -- use, sat on the bottom border like TextBox's page-advance cursor.  It
+  -- has to be the border row, not ty + th - 2: that is the last interior
+  -- row, which the last choice now occupies, and Menu.new widens the box to
+  -- widest + 3 so tx + tw - 2 is exactly that label's final glyph (#564).
   if self.maxVisible and self.scroll + self.maxVisible < #self.items then
     Font.drawCode(Theme.moreArrow, (self.tx + self.tw - 2) * 8,
-      (self.ty + self.th - 2) * 8)
+      (self.ty + self.th - 1) * 8)
   end
   love.graphics.setColor(1, 1, 1, 1)
 end

src/ui/OptionsMenu.lua

@@ -20,6 +20,7 @@ local GameSpeed = require("src.core.GameSpeed")
 local GameVersion = require("src.core.GameVersion")
 local VideoMode = require("src.core.VideoMode")
 local FrameCap = require("src.core.FrameCap")
+local Performance = require("src.core.Performance")
 local Logger = require("src.core.Logger")
 local Runtime = require("src.mods.Runtime")
 local OptionRows = require("src.ui.OptionRows")
@@ -202,6 +203,21 @@ local function buildRows(game)
         require("src.core.Music").setFilterLevel(o.musicFilter)
         return true
       end },
+    -- Heads the port's display group: one tier that scales the heavy extras
+    -- (TILT / GBC FX / survey ZOOM) and the FPS ceiling for weaker devices.
+    -- AUTO picks a default from the hardware; every tier is overridable.
+    -- Re-applies live so the extras clamp (or, on a higher tier, restore to
+    -- the player's stored TILT / GBC FX / ZOOM) the moment the row changes.
+    { id = "performance", label = Strings("PERFORMANCE"),
+      value = function(g)
+        return Strings(Performance.label(g.save.options.performance))
+      end,
+      step = function(g, dir)
+        local o = g.save.options
+        o.performance = Performance.cycle(o.performance, dir)
+        g:applyOptions(o)
+        return true
+      end },
     { id = "colors", label = Strings("COLORS"),
       value = function(g)
         return PaletteFX.modeLabel(g.save.options.colors or "gbc")
@@ -322,6 +338,25 @@ local function buildRows(game)
       activate = function(g)
         require("src.ui.Screens").push(g, "BindingsMenu")
       end },
+    -- permanent on-screen pad toggle (#327); layout editing stays in the
+    -- launcher.  Hidden where the overlay never appears (desktop without
+    -- POKEPORT_TOUCH), so the row costs a non-mobile install nothing.
+    { id = "touchControls", label = Strings("TOUCH PAD"),
+      value = function(g)
+        local tc = g.save.options.touchControls
+        local on = not (type(tc) == "table" and tc.enabled == false)
+        return on and Strings("ON") or Strings("OFF")
+      end,
+      step = function(g)
+        local o = g.save.options
+        local tc = type(o.touchControls) == "table" and o.touchControls or {}
+        local on = not (tc.enabled == false)
+        tc.enabled = not on
+        -- keep any saved positions when toggling
+        o.touchControls = tc
+        require("src.core.TouchControls"):applyOptions(o)
+        return true
+      end },
   }
   -- issue #136: hide GBC FX on Android/iOS -- the present shader soft-bricks
   if not GBCFX.isSupported() then
@@ -331,6 +366,21 @@ local function buildRows(game)
     end
     rows = filtered
   end
+  -- TOUCH PAD only where the overlay can appear (mobile, or desktop with
+  -- POKEPORT_TOUCH=1).  POKEPORT_TOUCH=0 forces it off everywhere.
+  do
+    local env = os.getenv("POKEPORT_TOUCH")
+    local osName = love.system and love.system.getOS and love.system.getOS()
+    local show = env == "1"
+      or (env ~= "0" and (osName == "Android" or osName == "iOS"))
+    if not show then
+      local filtered = {}
+      for _, row in ipairs(rows) do
+        if row.id ~= "touchControls" then filtered[#filtered + 1] = row end
+      end
+      rows = filtered
+    end
+  end
   -- PIKACHU VOL only means something where the voice clips exist: Yellow
   -- (data.audio.pikaCries is the clip count the importer wrote).  Red/Blue
   -- keep the row list they always had.
@@ -398,10 +448,21 @@ function OptionsMenu:update(dt)
     elseif row and row.step then
       changed = row.step(self.game, dir) and true or false
     elseif input:wasPressed("a") then -- CANCEL
+      -- DisplayOptionMenu .exitMenu (engine/menus/main_menu.asm) is the
+      -- only spot in this menu that plays SFX_PRESS_AB: A on a setting row
+      -- and the Left/Right toggles stay silent (#570).  game.data is nil
+      -- under the stub games the UI harnesses drive.
+      if self.game.data then
+        require("src.core.Sound").play(self.game.data, "Press_AB")
+      end
       self.game.stack:pop()
       if self.onCancel then self.onCancel() end
     end
   elseif input:wasPressed("b") or input:wasPressed("start") then
+    -- .exitMenu again: B and START leave the same way, sound and all
+    if self.game.data then
+      require("src.core.Sound").play(self.game.data, "Press_AB")
+    end
     self.game.stack:pop()
     if self.onCancel then self.onCancel() end
   end

src/ui/PartyMenu.lua

@@ -310,6 +310,14 @@ function PartyMenu:update(dt)
   local input = self.game.input
   local party = self.party or self.game.save.party
 
+  -- HandlePartyMenuInput (home/pokemon.asm) and the field-move submenu
+  -- (engine/menus/start_sub_menus.asm .chosePokemon) both run through
+  -- HandleMenuInput_, which beeps SFX_PRESS_AB on any A or B press (#570).
+  -- game.data is nil under the stub games the UI harnesses drive.
+  if self.game.data and (input:wasPressed("a") or input:wasPressed("b")) then
+    require("src.core.Sound").play(self.game.data, "Press_AB")
+  end
+
   if self.submenu then
     local n = #self.subItems
     if input:wasPressed("up") then

src/ui/PlayerPC.lua

@@ -73,10 +73,11 @@ local function withdraw(game)
   local pc = game.save.pcItems
   game.stack:push(ListMenu.new(game, "WITHDRAW ITEM", buildItems(game, pc), {
     messageBox = true,
+    noSound = true, -- PlayerPCMenu holds BIT_NO_MENU_BUTTON_SOUND (#570)
     onChoose = function(item, list)
       askQuantity(game, list, pc[item.value] or 1, item.value, function(qty)
         local Bag = require("src.inventory.Bag")
-        if not Bag.add(game.save, item.value, qty) then
+        if not Bag.add(game.save, item.value, qty, game.data) then
           list.footer = Strings("You can't carry\nany more items.")
           return
         end
@@ -110,6 +111,7 @@ local function deposit(game)
   end
   game.stack:push(ListMenu.new(game, "DEPOSIT ITEM", buildItems(game, depositable), {
     messageBox = true,
+    noSound = true, -- PlayerPCMenu holds BIT_NO_MENU_BUTTON_SOUND (#570)
     onChoose = function(item, list)
       askQuantity(game, list, inv[item.value] or 1, item.value, function(qty)
         if pcFull(game, pc, item.value) then
@@ -130,6 +132,7 @@ local function toss(game)
   local pc = game.save.pcItems
   game.stack:push(ListMenu.new(game, "TOSS ITEM", buildItems(game, pc), {
     messageBox = true,
+    noSound = true, -- PlayerPCMenu holds BIT_NO_MENU_BUTTON_SOUND (#570)
     onChoose = function(item, list)
       local def = game.data.items[item.value]
       if (def and def.keyItem) or item.value:find("^HM_") then

src/ui/PokedexMenu.lua

@@ -50,11 +50,13 @@ function PokedexMenu.new(game, opts)
     footer = Strings("SEEN %d  OWNED %d", seen, owned),
     pageJump = true, -- Left/Right page jumps like the original
     onCancel = opts.onCancel, -- B returns to the start menu when opened from it
-    onChoose = function(item)
+    onChoose = function(item, dexList)
       if not item.value then return end
       -- the DATA / CRY / AREA / QUIT choice (engine/menus/pokedex.asm
       -- PokedexMenuItemsText); CRY keeps the side menu open like the
-      -- original, QUIT returns to the list
+      -- original.  B is what returns to the list: HandlePokedexSideMenu
+      -- hands back b=2 for B and b=1 for QUIT, and ShowPokedexMenu sends
+      -- b=1 to .exitPokedex, so QUIT closes the whole Pokédex (#571)
       local Menu = require("src.ui.Menu")
       local Screens = require("src.ui.Screens")
       local entries = {
@@ -91,7 +93,13 @@ function PokedexMenu.new(game, opts)
             or Strings("Printer error!\n%s", tostring(err))))
         end }
       end
-      entries[#entries + 1] = { label = Strings("QUIT") }
+      entries[#entries + 1] = { label = Strings("QUIT"), onSelect = function()
+        -- .exitPokedex: drop the dex list too and hand back to whoever
+        -- opened it (the start menu, whose saved cursor is still on
+        -- POKéDEX -- wBattleAndStartSavedMenuItem)
+        dexList:close()
+        if opts.onCancel then opts.onCancel() end
+      end }
       game.stack:push(Menu.new(game, entries,
         { tx = 12, ty = 8, tw = 8,
           th = #entries * 2 + 2 }))

src/ui/ShopMenu.lua

@@ -67,7 +67,7 @@ local function buy(game, stock)
               list.footer = notEnough
               return
             end
-            if not Bag.add(game.save, item.value, qty) then
+            if not Bag.add(game.save, item.value, qty, game.data) then
               list.footer = txt(game, "_PokemartItemBagFullText",
                                 Strings("You can't carry\nany more items."))
               return

src/ui/TitleState.lua

@@ -7,6 +7,8 @@ local Font = require("src.render.Font")
 local Music = require("src.core.Music")
 local GameVersion = require("src.core.GameVersion")
 local Strings = require("src.core.Strings")
+local Runtime = require("src.mods.Runtime")
+local Logger = require("src.core.Logger")
 
 local TitleState = {}
 TitleState.__index = TitleState
@@ -300,6 +302,8 @@ local function hasSave()
   return ok and info ~= nil
 end
 
+local function sameItems(_, items) return items end
+
 -- The CONTINUE info window (main_menu.asm DisplayContinueGameInfo):
 -- PLAYER / BADGES / POKéDEX / TIME over the title, shown after choosing
 -- CONTINUE.  A confirms and loads the game, B returns to the main menu.
@@ -375,6 +379,13 @@ function TitleState:openMenu()
       love.event.quit()
     end
   end })
+  local hooked = Runtime.call("ui.title_menu.items", sameItems, game, items)
+  if type(hooked) == "table" then
+    items = hooked
+  else
+    Logger.error("ui.title_menu.items returned %s; keeping the vanilla items",
+                 type(hooked))
+  end
   local th = #items * 2 + 2
   local menu = Menu.new(game, items, { tx = 0, ty = 0, tw = 13, th = th })
   -- full-width title LOGO zones would recolor this box; see sgbPalettes

src/ui/TouchControlsEditor.lua

@@ -0,0 +1,277 @@
+-- Launcher touch-controls editor (#327): drag each on-screen button to a
+-- new spot, toggle the overlay off entirely, Reset to defaults, Done to
+-- persist into options.lua.  Opened from the game panel's "Touch Controls"
+-- button; main.lua suspends the launcher the same way it does for the
+-- save editor.
+--
+-- Draws in full window LOVE units -- the same space TouchControls uses
+-- after Renderer:endFrame -- so what you drag here is what you get in play.
+
+local SaveData = require("src.core.SaveData")
+local TouchControls = require("src.core.TouchControls")
+
+local Editor = {}
+
+local PAL = {
+  bgTop = { 8, 14, 36 },
+  bgBot = { 4, 8, 22 },
+  white = { 245, 248, 255 },
+  label = { 160, 175, 210 },
+  green = { 80, 220, 140 },
+  red = { 240, 90, 110 },
+  card = { 18, 28, 58 },
+  stroke = { 120, 150, 220 },
+}
+
+local function col(c, a)
+  love.graphics.setColor(c[1] / 255, c[2] / 255, c[3] / 255, a or 1)
+end
+
+local function inside(r, x, y)
+  return r and x >= r.x and x <= r.x + r.w and y >= r.y and y <= r.y + r.h
+end
+
+local function roundRect(mode, x, y, w, h, r)
+  love.graphics.rectangle(mode, x, y, w, h, r, r)
+end
+
+function Editor.load(opts)
+  opts = opts or {}
+  Editor.onClose = opts.onClose
+  Editor.drag = nil
+  Editor.rects = {}
+  Editor.fonts = {
+    title = love.graphics.newFont(28),
+    body = love.graphics.newFont(16),
+    btn = love.graphics.newFont(18),
+  }
+  local optsTbl = SaveData.loadOptions()
+  TouchControls:init()
+  TouchControls:ensureImages()
+  TouchControls:applyOptions(optsTbl)
+  TouchControls:setPreview(true)
+  Editor.enabled = TouchControls.enabled ~= false
+end
+
+function Editor.unload()
+  TouchControls:setPreview(false)
+  TouchControls:reset()
+  Editor.drag = nil
+  Editor.onClose = nil
+end
+
+local function persist()
+  local opts = SaveData.loadOptions()
+  local cfg = TouchControls:config()
+  opts.touchControls = {
+    enabled = cfg.enabled,
+    positions = cfg.positions,
+  }
+  SaveData.saveOptions(opts)
+end
+
+local function close()
+  persist()
+  local cb = Editor.onClose
+  Editor.unload()
+  if cb then cb() end
+end
+
+local function resetLayout()
+  TouchControls:clearPositions()
+end
+
+local function toggleEnabled()
+  Editor.enabled = not Editor.enabled
+  TouchControls.enabled = Editor.enabled
+  if not Editor.enabled then TouchControls:reset() end
+end
+
+function Editor.update(_dt)
+  -- drag follows the live pointer when love.touch / mouse is available;
+  -- touchmoved / mousemoved also update, so this is a belt-and-suspenders
+  -- path for Android where move events can be thin
+  if not Editor.drag then return end
+  local x, y
+  if love.touch and love.touch.getPosition and Editor.drag.touchId then
+    local ok, tx, ty = pcall(love.touch.getPosition, Editor.drag.touchId)
+    if ok and tx then x, y = tx, ty end
+  end
+  if not x and love.mouse then
+    x, y = love.mouse.getPosition()
+  end
+  if x then
+    TouchControls:setControlCenter(
+      Editor.drag.name,
+      x - Editor.drag.offX,
+      y - Editor.drag.offY)
+  end
+end
+
+function Editor.draw()
+  local SafeArea = require("src.core.SafeArea")
+  local fullW, fullH = love.graphics.getDimensions()
+  local ox, oy, ww, wh = SafeArea.rect()
+  local s = math.max(0.75, math.min(1.4, wh / 768))
+  Editor.rects = {}
+
+  -- radial-ish navy field (two stacked fills; matches launcher atmosphere)
+  col(PAL.bgBot)
+  love.graphics.rectangle("fill", 0, 0, fullW, fullH)
+  col(PAL.bgTop, 0.85)
+  love.graphics.circle("fill", ox + ww * 0.5, oy + wh * 0.15, math.max(ww, wh) * 0.55)
+
+  local pad = 18 * s
+  local barH = 56 * s
+  local btnH = 40 * s
+  local btnW = 100 * s
+
+  -- top bar (inside the safe area so it clears the notch / status bar)
+  col(PAL.card, 0.92)
+  love.graphics.rectangle("fill", 0, 0, fullW, oy + barH + pad)
+  col(PAL.stroke, 0.35)
+  love.graphics.setLineWidth(1)
+  love.graphics.line(0, oy + barH + pad, fullW, oy + barH + pad)
+
+  love.graphics.setFont(Editor.fonts.title)
+  col(PAL.white)
+  love.graphics.print("Touch Controls", ox + pad, oy + pad + 4 * s)
+
+  -- Done / Reset
+  local done = { x = ox + ww - pad - btnW, y = oy + pad + (barH - btnH) / 2,
+                 w = btnW, h = btnH }
+  local reset = { x = done.x - 10 * s - btnW, y = done.y, w = btnW, h = btnH }
+  Editor.rects.done, Editor.rects.reset = done, reset
+
+  local function chromeBtn(r, label, fill)
+    col(fill, 0.9)
+    roundRect("fill", r.x, r.y, r.w, r.h, 8 * s)
+    col(PAL.white, 0.2)
+    roundRect("line", r.x, r.y, r.w, r.h, 8 * s)
+    love.graphics.setFont(Editor.fonts.btn)
+    col(PAL.white)
+    local tw = Editor.fonts.btn:getWidth(label)
+    love.graphics.print(label, r.x + (r.w - tw) / 2,
+                        r.y + (r.h - Editor.fonts.btn:getHeight()) / 2)
+  end
+  chromeBtn(reset, "Reset", { 60, 70, 110 })
+  chromeBtn(done, "Done", PAL.green)
+
+  -- enable toggle card
+  local cardY = oy + barH + pad + 14 * s
+  local cardH = 64 * s
+  local cardX, cardW = ox + pad, ww - 2 * pad
+  col(PAL.card, 0.88)
+  roundRect("fill", cardX, cardY, cardW, cardH, 12 * s)
+  col(PAL.stroke, 0.4)
+  roundRect("line", cardX, cardY, cardW, cardH, 12 * s)
+
+  love.graphics.setFont(Editor.fonts.body)
+  col(PAL.label)
+  love.graphics.print("On-screen controls", cardX + 16 * s,
+                      cardY + 12 * s)
+  love.graphics.setFont(Editor.fonts.btn)
+  local on = Editor.enabled
+  col(on and PAL.green or PAL.red)
+  love.graphics.print(on and "ON" or "OFF", cardX + 16 * s,
+                      cardY + 34 * s)
+
+  local toggleW = 110 * s
+  local toggle = {
+    x = cardX + cardW - 16 * s - toggleW,
+    y = cardY + (cardH - btnH) / 2,
+    w = toggleW, h = btnH,
+  }
+  Editor.rects.toggle = toggle
+  chromeBtn(toggle, on and "Disable" or "Enable",
+            on and PAL.red or PAL.green)
+
+  -- hint
+  love.graphics.setFont(Editor.fonts.body)
+  col(PAL.label, 0.9)
+  local hint = on
+    and "Drag each button to reposition. Layout is saved when you tap Done."
+    or "Controls are hidden in-game. Enable them to show and edit the layout."
+  love.graphics.printf(hint, ox + pad, cardY + cardH + 12 * s, ww - 2 * pad, "left")
+
+  -- the overlay itself (preview mode; dimmed when disabled)
+  TouchControls:draw()
+
+  -- highlight the control under drag
+  if Editor.drag then
+    local L = TouchControls:layout()
+    local zone = L[Editor.drag.name]
+    if zone then
+      love.graphics.setLineWidth(3 * s)
+      col(PAL.green, 0.85)
+      love.graphics.circle("line", zone.cx, zone.cy, zone.w * 0.62)
+    end
+  end
+end
+
+local function beginDrag(id, x, y)
+  -- chrome takes priority over controls
+  if inside(Editor.rects.done, x, y) then close(); return end
+  if inside(Editor.rects.reset, x, y) then resetLayout(); return end
+  if inside(Editor.rects.toggle, x, y) then toggleEnabled(); return end
+
+  local name = TouchControls:hitTest(x, y)
+  if not name then return end
+  local zone = TouchControls:layout()[name]
+  Editor.drag = {
+    name = name,
+    touchId = id,
+    offX = x - zone.cx,
+    offY = y - zone.cy,
+  }
+end
+
+local function moveDrag(id, x, y)
+  local d = Editor.drag
+  if not d then return end
+  if d.touchId ~= nil and id ~= nil and d.touchId ~= id then return end
+  TouchControls:setControlCenter(d.name, x - d.offX, y - d.offY)
+end
+
+local function endDrag(id)
+  local d = Editor.drag
+  if not d then return end
+  if d.touchId ~= nil and id ~= nil and d.touchId ~= id then return end
+  Editor.drag = nil
+end
+
+function Editor.mousepressed(x, y, button)
+  if button ~= 1 then return end
+  beginDrag("mouse", x, y)
+end
+
+function Editor.mousemoved(x, y)
+  if love.mouse.isDown(1) then moveDrag("mouse", x, y) end
+end
+
+function Editor.mousereleased(x, y, button)
+  if button ~= 1 then return end
+  endDrag("mouse")
+end
+
+function Editor.touchpressed(id, x, y)
+  beginDrag(id, x, y)
+end
+
+function Editor.touchmoved(id, x, y)
+  moveDrag(id, x, y)
+end
+
+function Editor.touchreleased(id, x, y)
+  endDrag(id)
+end
+
+function Editor.keypressed(key)
+  if key == "escape" or key == "return" or key == "space" then
+    close()
+  elseif key == "r" then
+    resetLayout()
+  end
+end
+
+return Editor

src/ui/TradeAnim.lua

@@ -49,9 +49,10 @@ local function dexOf(game, mon)
 end
 
 local function spriteOf(game, mon)
-  local path = require("src.pokemon.Sprites").path(game.data, mon.species, "front",
-    { mon = mon, kind = "trade" })
-  return tryImage(path)
+  local path, trueColor = require("src.pokemon.Sprites").path(
+    game.data, mon.species, "front", { mon = mon, kind = "trade" })
+  local image = tryImage(path)
+  return image, image and trueColor or false
 end
 
 local function expand(game, key, subs)
@@ -110,8 +111,8 @@ function TradeAnim.new(game, opts)
     cableBallAlt = tryImage(art.cableBallAlt or DEFAULT_ART.cableBallAlt),
     bubble = tryImage(art.bubble or DEFAULT_ART.bubble),
   }
-  self.sentSprite = spriteOf(game, self.sent)
-  self.recvSprite = spriteOf(game, self.received)
+  self.sentSprite, self.sentSpriteTrueColor = spriteOf(game, self.sent)
+  self.recvSprite, self.recvSpriteTrueColor = spriteOf(game, self.received)
 
   self.seq = 1
   self.phase = SEQ[1]
@@ -349,8 +350,8 @@ function TradeAnim:drawMonInfo(mon, ot, otId, boxTy)
   love.graphics.setColor(1, 1, 1, 1)
 end
 
-function TradeAnim:drawIconInBubble(mon, x, y)
-  local spr = (mon.species == self.received.species) and self.recvSprite or self.sentSprite
+function TradeAnim:drawIconInBubble(sprite, x, y)
+  local spr = sprite
   if spr then
     local sw, sh = spr:getDimensions()
     local s = 16 / math.max(sw, sh)
@@ -425,6 +426,10 @@ function TradeAnim:draw()
     -- hWY $50, so it sits in the bottom half of the screen
     if self.monVisible and self.sentSprite then
       love.graphics.draw(self.sentSprite, 56, 16)
+      if self.sentSpriteTrueColor then
+        require("src.render.PaletteFX").markTrueColor(
+          56 - self.scx, 16, self.sentSprite:getDimensions())
+      end
     end
     self:drawMonInfo(self.sent, self.playerOt, self.playerOtId, 10)
     love.graphics.pop()
@@ -466,8 +471,13 @@ function TradeAnim:draw()
     love.graphics.translate(160, 0)
     self:drawRightGB()
     love.graphics.pop()
-    local mon = (p == "transfer_lr") and self.sent or self.received
-    self:drawIconInBubble(mon, self.monX, self.monY)
+    local sprite
+    if p == "transfer_lr" then
+      sprite = self.sentSprite
+    else
+      sprite = self.recvSprite
+    end
+    self:drawIconInBubble(sprite, self.monX, self.monY)
     if self.cableFlash then
       love.graphics.setColor(1, 1, 1, 0.15)
       love.graphics.rectangle("fill", 0, 32, 160, 8)
@@ -477,6 +487,10 @@ function TradeAnim:draw()
   elseif p == "show_enemy" then
     if self.monVisible and self.recvSprite then
       love.graphics.draw(self.recvSprite, 56, 16)
+      if self.recvSpriteTrueColor then
+        require("src.render.PaletteFX").markTrueColor(
+          56, 16, self.recvSprite:getDimensions())
+      end
     end
     self:drawMonInfo(self.received, self.enemyName, self.enemyOtId, 10)
   end

src/ui/YellowIntro.lua

@@ -148,6 +148,37 @@ local SPEED_BARS = {
   { 0xE0, 0x80, 4 }, { 0xF0, 0x90, 2 },
 }
 
+-- PlayIntroScene's .loop (pokeyellow engine/movie/intro_yellow.asm) ends
+-- every iteration with its own `call DelayFrame`, so one scene handler costs
+-- one frame plus whatever DelayFrame calls it makes itself.  The port runs a
+-- handler inside a single update() tick, so every one of those internal
+-- DelayFrame calls has to be spent explicitly or the movie runs short of
+-- hardware.  Three places owe frames:
+--
+--   SETUP_SCENE_DELAY  scenes 2/4/6/8/10/12 open with
+--                      YellowIntro_BlankPalsDelay2AndDisableLCD: rBGP/rOBP0/
+--                      rOBP1 to $00 (color 0 in every shade -- the lightest,
+--                      white on DMG), two DelayFrame calls, then DisableLCD.
+--                      Two internal plus the loop's own is a 3-frame
+--                      iteration, after which the next wait scene takes its
+--                      first timer decrement.  Func_f9e9a restores rBGP $e4
+--                      at the end of the same handler.
+--   HEAD_FRAMES        PlayIntroScene spends a DelayFrame between
+--                      InitYellowIntroGFXAndMusic (which ends in PlayMusic)
+--                      and the first .loop pass, and YellowIntroScene0 then
+--                      owns a whole iteration of its own.
+--   EXIT_FRAMES        .go_to_title_screen blanks the palettes and spends
+--                      four DelayFrame calls clearing the tilemap and OAM
+--                      before the title screen is built.
+--
+-- These restore the movie's real elapsed length; they do NOT lengthen the
+-- intro song.  title.asm's StopAllMusic before MUSIC_TITLE_SCREEN is
+-- unconditional (only PikachuCry1 is waited on), so hardware cuts
+-- Music_YellowIntro off mid-phrase too (#523).
+local SETUP_SCENE_DELAY = 3
+local HEAD_FRAMES = 2
+local EXIT_FRAMES = 4
+
 -- scene-6 sine (YellowIntro_Copy8BitSineWave.SineWave), signed SCY deltas
 local WAVE = { 0, 0, 1, 2, 2, 3, 3, 3, 4, 3, 3, 3, 2, 2, 1, 0,
                0, 0, -1, -2, -2, -3, -3, -3, -4, -3, -3, -3, -2, -2, -1, 0 }
@@ -208,6 +239,8 @@ function YellowIntro.new(game, onDone)
   self.palName = "MEWMON" -- PalPacket_Generic
   self.objects = {}
   self.cloudFrame = 0
+  self.pendingThen = nil  -- what enterDelay runs once pendingDelay hits 0 (#523)
+  self.pendingDelay = 0
 
   self.atlas1 = tryImage("assets/generated/intro/yellow_intro_1.png")
   self.atlas2 = tryImage("assets/generated/intro/yellow_intro_2.png")
@@ -559,6 +592,24 @@ function YellowIntro:startScene(scene)
   end
 end
 
+-- Spend `frames` real frames, then run fn: the port's stand-in for the
+-- DelayFrame calls a pokeyellow scene handler makes inside its own
+-- PlayIntroScene .loop iteration (#523).  fn may be nil to just burn time.
+function YellowIntro:enterDelay(frames, fn)
+  self.pendingDelay = frames
+  self.pendingThen = fn
+end
+
+-- YellowIntro_BlankPalsDelay2AndDisableLCD blanks the palettes for the
+-- delay; Func_f9e9a puts rBGP back to $e4 at the tail of the same handler.
+function YellowIntro:enterSetupScene(scene)
+  self.bgp = 0x00
+  self:enterDelay(SETUP_SCENE_DELAY, function()
+    self.bgp = 0xE4
+    self:startScene(scene)
+  end)
+end
+
 function YellowIntro:enter()
   if self.pre then return end -- pre-roll first; beginScenes takes over
   self:beginScenes()
@@ -571,7 +622,11 @@ function YellowIntro:beginScenes()
   local song = songs and (songs.Music_YellowIntro and "Music_YellowIntro"
                           or songs.Music_IntroBattle and "Music_IntroBattle")
   if song then pcall(Music.play, data, song, false) end
-  self:startScene(0)
+  -- HEAD_FRAMES: the DelayFrame between PlayMusic and the first .loop pass
+  -- plus YellowIntroScene0's own iteration.  new() already laid down the
+  -- Func_f9e5f letterbox that InitYellowIntroGFXAndMusic writes, so these
+  -- frames show what hardware shows: the letterbox with no pika yet.
+  self:enterDelay(HEAD_FRAMES, function() self:startScene(0) end)
 end
 
 -- The movie's exit never stops the song (intro_yellow.asm PlayIntroScene
@@ -586,16 +641,44 @@ function YellowIntro:finish()
   if self.onDone then self.onDone() end
 end
 
+-- Both scene-loop exits (scene 17 running out, and the A/B/START skip) land
+-- on .go_to_title_screen, which calls YellowIntro_BlankPalettes and then
+-- spends EXIT_FRAMES DelayFrame calls clearing the tilemap and the OAM
+-- buffers before the title screen is built (#523).  The pre-roll's own skip
+-- is IntroMovie's path, not this one, and still finishes immediately.
+function YellowIntro:exitToTitle()
+  if self.finished or self.exiting then return end
+  self.exiting = true
+  self.bgp = 0x00
+  self:clearObjects()
+  self:enterDelay(EXIT_FRAMES, function() self:finish() end)
+end
+
 function YellowIntro:update(dt)
   if self.finished then return end
   if self.pre then
     self.pre:update(dt)
     return
   end
+  -- Ahead of the skip poll on purpose: JoypadLowSensitivity runs once at the
+  -- top of each .loop iteration, never inside a handler, so hardware is deaf
+  -- for the DelayFrame calls these ticks stand in for (#523).
+  if self.pendingDelay > 0 then
+    self.pendingDelay = self.pendingDelay - 1
+    if self.pendingDelay == 0 then
+      local fn = self.pendingThen
+      self.pendingThen = nil
+      if fn then fn() end
+    end
+    self:updateObjects()
+    if self.bgDirty then self:rebuildBgCanvas() end
+    return
+  end
+
   local input = self.game.input
   if input:wasPressed("a") or input:wasPressed("b")
      or input:wasPressed("start") then
-    self:finish()
+    self:exitToTitle()
     return
   end
 
@@ -605,7 +688,7 @@ function YellowIntro:update(dt)
       self.timer = self.timer - 1
     else
       self:clearObjects()
-      self:startScene(scene + 1)
+      self:enterSetupScene(scene + 1) -- BlankPalsDelay2AndDisableLCD (#523)
     end
   elseif scene == 3 then
     if self.timer > 0 then
@@ -613,7 +696,7 @@ function YellowIntro:update(dt)
       if self.scx ~= 0x68 then self.scx = self.scx + 4 end
     else
       self:clearObjects()
-      self:startScene(4)
+      self:enterSetupScene(4) -- BlankPalsDelay2AndDisableLCD (#523)
     end
   elseif scene == 7 then
     if self.timer > 0 then
@@ -625,7 +708,7 @@ function YellowIntro:update(dt)
       self.wave[255] = first
     else
       self:clearObjects()
-      self:startScene(8)
+      self:enterSetupScene(8) -- BlankPalsDelay2AndDisableLCD (#523)
     end
   elseif scene == 11 then
     if self.timer > 0 then
@@ -640,7 +723,7 @@ function YellowIntro:update(dt)
       self.timer = self.timer - 1
     else
       self:clearObjects()
-      self:startScene(12)
+      self:enterSetupScene(12) -- BlankPalsDelay2AndDisableLCD (#523)
     end
   elseif scene == 13 then
     if self.timer > 0 then
@@ -656,13 +739,17 @@ function YellowIntro:update(dt)
     if v then
       self.bgp = v
     else
-      -- .expired: everything despawns, letterbox returns, logo/face
-      -- object $7 appears for the strobe scene
+      -- .expired: everything despawns and the letterbox returns, then the
+      -- handler spends three DelayFrame calls with hAutoBGTransferEnabled
+      -- pushing that rebuilt tilemap to VRAM before it restores rBGP $e4
+      -- and spawns the logo/face object $7 for the strobe scene (#523).
       self:clearObjects()
       self:bgLetterbox()
-      self.bgp = 0xE4
-      self:spawn(7, 0x58, 0x58)
-      self:startScene(15)
+      self:enterDelay(3, function()
+        self.bgp = 0xE4
+        self:spawn(7, 0x58, 0x58)
+        self:startScene(15)
+      end)
     end
   elseif scene == 15 then
     if self.timer > 0 then
@@ -687,7 +774,7 @@ function YellowIntro:update(dt)
     if self.timer > 0 then
       self.timer = self.timer - 1
     else
-      self:finish()
+      self:exitToTitle()
       return
     end
   end

src/world/FieldDefaults.lua

@@ -89,6 +89,11 @@ local PLAYER_SPRITES = {
 local PLAYER_PICS = {
   back = "assets/generated/battle/redb.png",
   demoBack = "assets/generated/battle/oldmanb.png",
+  -- LoadPlayerBackPic keys the demo pic off wBattleType, not off "is a
+  -- demo": BATTLE_TYPE_PIKACHU (Yellow's Pallet catch scene) puts PROF.OAK
+  -- in the player's place with his own back pic, not the old man's (#557).
+  -- Red/Blue never reach it -- only the Yellow script names that thrower.
+  oakBack = "assets/generated/battle/profoakb.png",
   front = "assets/generated/trainer_card/red.png",
 }
 
@@ -185,7 +190,7 @@ FieldDefaults.CONSTANTS = {
     neighborHops = 2,         -- connection hops drawn around the current map
     stepFrames = 16,          -- 1px per frame, 16 frames per tile
     bikeStepFrames = 8,       -- the bicycle doubles walking speed
-    turnFrames = 2,           -- the extra OverworldLoop pass after a turn
+    turnFrames = 4,           -- tap window before a turn commits to a step
   },
   -- cumulative slot thresholds out of 256 (engine/battle/wild_encounters.asm)
   encounterBuckets = { 51, 102, 141, 166, 191, 216, 229, 242, 253, 256 },

src/world/OverworldController.lua

@@ -3,6 +3,7 @@
 -- surfing, Cut trees, trainer sight lines, and dispatches interactions to
 -- map scripts (data/scripts/), marts, nurses or extracted text.
 
+local Assets = require("src.render.Assets")
 local Camera = require("src.render.Camera")
 local Collision = require("src.world.Collision")
 local Encounter = require("src.world.Encounter")
@@ -359,6 +360,36 @@ function OverworldState:setMap(mapId, x, y, facing, opts)
   else
     self.player = Player.new(Game.data, x, y, facing)
   end
+  -- boot only: the original persists the surf state.  wWalkBikeSurfState
+  -- (ram/wram.asm) lives inside wMainDataStart..wMainDataEnd, which
+  -- engine/menus/save.asm block-copies into sMainData on save and back out
+  -- on load (sram.asm declares sMainData as `ds wMainDataEnd -
+  -- wMainDataStart`), and Continue never clears it -- the only `xor a /
+  -- ld [wWalkBikeSurfState], a` on that path is the cable club's.  Restore
+  -- it here, before Music.playMap reads it below and before
+  -- PikachuFollower.onMapEntered, matching LoadMapData calling
+  -- LoadPlayerSpriteGraphics ahead of PlayDefaultMusic (home/overworld.asm,
+  -- home/audio.asm).  Without this the player resumed on foot on a water
+  -- cell, which softlocks here: Collision.canMove (src/world/Collision.lua)
+  -- picks land tile-pairs whenever mover.surfing is falsy, and land
+  -- tile-pairs never permit stepping off a water cell (#536).  Same
+  -- boot-only shape as the refreshStandingOnWarp door-mat restore (#378).
+  if opts and opts.via == "boot" then
+    local ps = Game.save and Game.save.player
+    if ps and ps.surfing ~= nil then
+      self.player.surfing = ps.surfing and true or false
+    else
+      -- saves written before #536 carry no flag.  Map:isWaterCell alone is
+      -- not self-sufficient (see src/world/Map.lua: water and shore share
+      -- one lookup, and no tileset stamps waterTiles, so tile $14 -- a
+      -- walkable floor in HOUSE/GATE/LOBBY/MANSION/MUSEUM -- reads as
+      -- water), so gate it the way facingIsShoreOrWater does and require a
+      -- cell you could not be standing on upright.
+      self.player.surfing = self:tilesetHasWater()
+        and not self.map:isWalkableCell(x, y)
+        and self.map:isWaterCell(x, y)
+    end
+  end
   -- crossConnection re-arms this after setMap; clear so a warp/reload
   -- cannot leave a stale deferred PlayMapMusic pending
   self.pendingSeamMusic = nil
@@ -550,9 +581,26 @@ end
 -- UI-pass palette (text boxes and menus tint with the current map).  OG RED
 -- resolves every name to the one global red BG palette inside PaletteFX.pal,
 -- so this needs no mode-specific branch.
+--
+-- TalkToPikachu's framed frontpic is the one exception: pokeyellow
+-- LoadOverworldPikachuFrontpicPalettes loads the map pal as slot 0 and
+-- PAL_PIKACHU_PORTRAIT as slot 1, then ATTR_BLK's the 5x5 pic at
+-- (7,6)-(11,10) onto slot 1 (engine/gfx/palettes.asm:345-391).  Without
+-- that zone the pic wears the route/town palette and looks washed out.
 function OverworldState:sgbPalettes()
   local PaletteFX = require("src.render.PaletteFX")
-  return PaletteFX.wholeNamed(Game.data, self:paletteNameFor(self.map))
+  local mapName = self:paletteNameFor(self.map)
+  if self.emote and self.emote.pikaPic then
+    local base = PaletteFX.pal(Game.data, mapName)
+    if not base then return nil end
+    local zones = { PaletteFX.whole(base) }
+    local portrait = PaletteFX.pal(Game.data, "PIKACHU_PORTRAIT")
+    if portrait then
+      zones[#zones + 1] = PaletteFX.zone(portrait, 7, 6, 11, 10)
+    end
+    return zones
+  end
+  return PaletteFX.wholeNamed(Game.data, mapName)
 end
 
 -- World-pass palette zones in world-canvas pixels: each visible map
@@ -1040,19 +1088,38 @@ function OverworldState:handleInput()
   -- OverworldLoop (home/overworld.asm) gates ALL of JoypadOverworld on
   -- wWalkCounter == 0 ("if the player sprite has not yet completed the
   -- walking animation" it jumps straight to .moveAhead): A, START and
-  -- direction initiation are only ever looked at while the player stands
-  -- on a tile, and a button pressed mid-step is simply never seen.
-  -- Without this gate a mid-step A/START pushed its TextBox/StartMenu
-  -- right there and froze Red between tiles, mid-animation (#286).  Held
-  -- directions need no buffering -- isDown below picks them up on the
-  -- landing frame.
-  if self.player.moving then return end
+  -- direction initiation are only ever ACTED ON while the player stands on
+  -- a tile.  Without this gate a mid-step A/START pushed its TextBox/
+  -- StartMenu right there and froze Red between tiles, mid-animation
+  -- (#286).  Held directions need no buffering -- isDown below picks them
+  -- up on the landing frame.
+  --
+  -- The original defers the poll rather than discarding it, though.  Joypad
+  -- (engine/joypad.asm _Joypad) computes hJoyPressed against hJoyLast and
+  -- advances hJoyLast only when something calls it; the mid-step path never
+  -- does, and vblank's per-frame ReadJoypad refreshes hJoyInput alone.
+  -- hJoyLast is frozen for the whole animation, so a button pressed
+  -- mid-step and STILL HELD when the step lands reads as a fresh press at
+  -- the next poll -- one released before then is genuinely lost.  Dropping
+  -- the edge outright made START a coin flip on the Cycling Road roll,
+  -- where the pull below re-arms a step on the single idle frame in
+  -- bikeStepFrames (#525).
+  if self.player.moving then
+    local held = self.joyLatch
+    if not held then held = {}; self.joyLatch = held end
+    if input:wasPressed("a") then held.a = true end
+    if input:wasPressed("start") then held.start = true end
+    return
+  end
+  local latch = self.joyLatch
+  self.joyLatch = nil
 
-  if input:wasPressed("a") then
+  if input:wasPressed("a") or (latch and latch.a and input:isDown("a")) then
     self:interact()
     return
   end
-  if input:wasPressed("start") then
+  if input:wasPressed("start")
+     or (latch and latch.start and input:isDown("start")) then
     require("src.core.Sound").play(Game.data, "Start_Menu")
     Screens.push(Game, "StartMenu")
     return
@@ -1088,6 +1155,13 @@ function OverworldState:handleInput()
     end
   end
 
+  -- .noDirectionButtonsPressed (home/overworld.asm) is the only place that
+  -- sets wCheckFor180DegreeTurn, so reaching this line -- a poll that found
+  -- no direction held -- is what re-arms the next turn in place.  The early
+  -- returns above (mid-step, A, START) skip it exactly as the original's
+  -- jumps to .moveAhead and .displayDialogue do (#415).
+  self.player.turnArmed = true
+
   -- Cycling Road's downhill pull: with no d-pad held the bike rolls
   -- south (home/overworld.asm JoypadOverworld's simulated PAD_DOWN).
   -- The mask there is PAD_CTRL_PAD | PAD_B | PAD_A, so HOLDING A or B
@@ -1736,7 +1810,7 @@ function OverworldState:tryHiddenObject(fx, fy)
     if h.x == fx and h.y == fy then
       save.hiddenTaken = save.hiddenTaken or {}
       if save.hiddenTaken[key] then return false end
-      if not require("src.inventory.Bag").add(save, h.item, 1) then
+      if not require("src.inventory.Bag").add(save, h.item, 1, Game.data) then
         Game.stack:push(TextBox.new(Game, Strings("You can't carry\nany more items!")))
         return true
       end
@@ -1824,9 +1898,20 @@ function OverworldState:tryHiddenObject(fx, fy)
     end
   end
 
-  -- bench guys (data/events/bench_guys.asm)
+  -- Bench guys (data/events/bench_guys.asm).  A hidden_event's fourth byte
+  -- is wHiddenEventFunctionArgument, not a facing gate -- pokered's own
+  -- macro comment says the SPRITE_FACING_* values parked there "do not
+  -- actually prevent the player from interacting with them in any
+  -- direction" (data/events/hidden_events.asm).  The facing that does decide
+  -- a bench guy is PrintBenchGuyText's own test against BenchGuyTextPointers,
+  -- SPRITE_FACING_LEFT for all twelve seats, which the manifest carries as
+  -- `textFacing`.  Gating on the hidden_event byte instead silenced the four
+  -- seats that store SPRITE_FACING_UP (Vermilion, Saffron, Fuchsia,
+  -- Cinnabar): (0,4) is the bench wall cell and can only ever be faced from
+  -- the right (#488).
   for _, h in ipairs(extras.benchGuys[self.map.id] or {}) do
-    if h.x == fx and h.y == fy and (not h.facing or h.facing == facing) then
+    local want = h.textFacing or h.facing
+    if h.x == fx and h.y == fy and (not want or want == facing) then
       local text = OverworldState.benchGuyText(Game.data, save, h.text)
       if text then
         Game.stack:push(TextBox.new(Game, text))
@@ -2093,6 +2178,7 @@ function OverworldState:billsHouseBillExits()
   local Commands = require("src.script.Commands")
   local ctx = { game = Game, save = Game.save, overworld = self }
   Commands.show_object(ctx, "BILLS_HOUSE", "BILLSHOUSE_BILL1")
+  require("src.world.PikachuFollower").onBillExitedMachine(Game, self)
   local function done()
     Game.save.flags.EVENT_MET_BILL = true
     Game.save.flags.EVENT_MET_BILL_2 = true
@@ -2355,7 +2441,7 @@ function OverworldState:talkTo(npc)
   -- (e.g. Blue's House wall Town Map / walking Daisy, #11).  Lua treats
   -- the string "0" as truthy, so screen it out and fall through to text.
   if d.item and d.item ~= "0" and d.item ~= 0 then
-    if not require("src.inventory.Bag").add(Game.save, d.item, 1) then
+    if not require("src.inventory.Bag").add(Game.save, d.item, 1, Game.data) then
       Game.stack:push(TextBox.new(Game, Strings("You can't carry\nany more items!")))
       return
     end
@@ -3761,7 +3847,15 @@ end
 -- dev-mode hot reload).  The neighbors go too: their strips render the
 -- same tileset.  When the active map is the one that changed, the player
 -- is clamped back in bounds, the NPC pool is reused so runtime handles
--- survive, and the tile-pair table is re-read.
+-- survive, and the tile-pair table is re-read.  keepMusic: a reload is not a
+-- map entry.  Its counterpart ReloadMapData (home/reload_tiles.asm) only
+-- re-reads the map view and the tileset tile patterns after the Pokedex /
+-- start menu / PC clobbered VRAM; map music starts from LoadMapData alone
+-- (home/overworld.asm, gated on BIT_NO_MAP_MUSIC).  Whatever is playing
+-- belongs to the state on top, so a COLORS cycle during a battle
+-- (PaletteFX.setMode reloads the live map to rebuild its baked atlas) must
+-- not drop the route theme over the battle song (#484).  The out-of-bounds
+-- fallback below is a real map change and keeps its map music.
 function OverworldState:reloadMap(mapId, reason)
   MapLoader.invalidate(mapId)
   for _, nb in ipairs(self.neighbors or {}) do MapLoader.invalidate(nb.map.id) end
@@ -3769,7 +3863,8 @@ function OverworldState:reloadMap(mapId, reason)
     local p = self.player
     local x, y, facing = p.cellX, p.cellY, p.facing
     Collision.load(Game.data)
-    self:setMap(mapId, x, y, facing, { seamless = true, via = "reload" })
+    self:setMap(mapId, x, y, facing,
+                { seamless = true, via = "reload", keepMusic = true })
     if not self.map:inBounds(x, y) then
       local heal = self:healPoint()
       Logger.warn("map %s reloaded out from under the player; sending to %s",
@@ -3914,6 +4009,31 @@ function OverworldState:draw()
   self:drawUI()
 end
 
+-- The emote sheet is OBJ art (engine/overworld/emotion_bubbles.asm builds the
+-- bubble out of shadow OAM), so it renders through OBP0, and GBPalNormal
+-- (home/palettes.asm:20-26 `ld a, %11010000 ; 3100 / ldh [rOBP0], a`) holds
+-- OBP0 at "3100": OBJ color 1 shows as shade 0, color 2 as shade 1, color 3
+-- as shade 3.  Blitting the raw sheet skipped that lift and left the "!"
+-- bubble's interior (color 1) at DMG shade 1 grey instead of white (#505).
+-- Same CPU-remap bake as SpriteRenderer.getObpImage and PartyMenu's obpIcon,
+-- and it resolves through Assets so a mod's emotes.png override still wins.
+-- Color 0's alpha (a tRNS entry on the extracted png) is what keys the
+-- bubble's corners out, so carry it through untouched.
+local function obpEmoteImage(path)
+  if not (love.image and love.image.newImageData) then
+    return love.graphics.newImage(Assets.resolve(path)) -- headless stub
+  end
+  local id = Assets.imageData(path)
+  id:mapPixel(function(_, _, r, _, _, a)
+    local v = 0
+    if r > 0.5 then v = 1               -- OBJ colors 0 and 1 -> shade 0
+    elseif r > 0.17 then v = 170 / 255  -- OBJ color 2 -> shade 1
+    end                                 -- OBJ color 3 -> shade 3
+    return v, v, v, a
+  end)
+  return love.graphics.newImage(id)
+end
+
 -- The SGB palette a tilt-mode billboard at flat foot (fx, fy) sits under.
 -- World zones are rectangles in flat world-canvas space (the current map's
 -- base fills the view; neighbour maps stack on top), so the last zone that
@@ -4153,7 +4273,7 @@ function OverworldState:drawWorld()
     local drawn = false
     if bubble and bubble.path then
       local ok, img = pcall(function()
-        self.emoteImg = self.emoteImg or love.graphics.newImage(bubble.path)
+        self.emoteImg = self.emoteImg or obpEmoteImage(bubble.path)
         return self.emoteImg
       end)
       -- EXCLAMATION_BUBBLE is index 0 -> first crop; the emote command
@@ -4475,10 +4595,11 @@ function OverworldState:drawUI()
   -- TalkToPikachu's picture box (engine/pikachu/pikachu_pic_animation.asm
   -- PlacePikapicTextBoxBorder: TextBoxBorder at (6,5) with b,c = 5,5, so a
   -- 7x7 box holding the 5x5 pic at (7,6) -- PikaAnimTilemap_1).  The
-  -- per-emotion frame gfx (gfx/pikachu/unknown_*) are not extracted, so the
-  -- front pic stands in for every frame of the script; PikachuFollower
-  -- .picLift lifts it on the runs that draw the alternate pose, and the
-  -- script's own duration times the beat (#407, #424).
+  -- script's base frame is ripped as pikachu/pikapic_N.png (#561) but the
+  -- pikaframe overlays on top of it are not, so PikachuFollower
+  -- .picLift lifts the base on the runs that draw the alternate pose, and the
+  -- script's own duration times the beat (#407, #424).  Palette zone
+  -- PAL_PIKACHU_PORTRAIT covers (7,6)-(11,10) via sgbPalettes above.
   if self.emote and self.emote.pikaPic then
     require("src.render.Font").drawBox(6, 5, 7, 7)
     -- one image per path, cached: this draws every frame of the hold, and
@@ -4516,6 +4637,11 @@ function OverworldState:captureSave(save)
   save.player.x = self.player.cellX
   save.player.y = self.player.cellY
   save.player.facing = self.player.facing
+  -- wWalkBikeSurfState (ram/wram.asm) sits inside the wMainDataStart..
+  -- wMainDataEnd range engine/menus/save.asm block-copies into sMainData,
+  -- so the original saves and restores the surf state; setMap's boot path
+  -- reads this back (#536).
+  save.player.surfing = self.player.surfing and true or false
 end
 
 return OverworldState

src/world/PikachuFollower.lua

@@ -189,6 +189,9 @@ function PikachuFollower.current(ow)
 end
 
 function PikachuFollower.onMapEntered(game, ow, opts)
+  -- Bill's House owns a short scripted scene that deliberately keeps
+  -- Pikachu off the normal trailing loop.  A new map instance ends it.
+  ow.pikachuBillsScene = nil
   remove(ow)
   if not shouldSpawn(game, ow) then return end
   -- opts.keepPikachu is the follower a connection crossing kept alive:
@@ -393,6 +396,7 @@ end
 -- (pikachu_follow.asm keeps it one walk step behind)
 function PikachuFollower.update(game, ow)
   if ow.pikaHop then return end -- the counter hop owns the follower (#417)
+  if ow.pikachuBillsScene then return end
   local npc = findFollower(ow)
   if not npc then
     if shouldSpawn(game, ow) then PikachuFollower.onMapEntered(game, ow) end
@@ -514,9 +518,12 @@ end
 -- pikachu_emotions.asm): pick a scripted emotion, then play its bubble
 -- and voiced PCM clip, and raise the framed Pikachu picture the original
 -- puts over the map (pikaemotion_pikapic -> pikachu_pic_animation.asm
--- PlacePikapicTextBoxBorder), drawn by OverworldController:drawUI.  The
--- per-emotion animation frames (gfx/pikachu/unknown_*) are not extracted,
--- so the front pic stands in for all twenty of them (#407).
+-- PlacePikapicTextBoxBorder), drawn by OverworldController:drawUI.  Each
+-- script's BASE 5x5 frame is ripped as pikachu/pikapic_N.png (#561); the
+-- pikaframe overlays it alternates with are a second full-body pose out of
+-- the same blob and are still unported, so picLift below stands in for
+-- their motion and the battle front pic covers caches built before the
+-- rip (#407).
 -- ---------------------------------------------------------------------
 
 -- PikachuEmotionTable, reduced to each entry's bubble + pikaemotion_pcm
@@ -711,9 +718,17 @@ function PikachuFollower.talk(game, ow, npc, done)
   -- 40x40 front pic is the size of PikaAnimTilemap_1's 5x5 base frame;
   -- Sprites.path keeps a mod's replacement skin in play.
   local Sprites = require("src.pokemon.Sprites")
-  local pic = Sprites.path(game.data, "PIKACHU", "front",
-                           { kind = "overworld" })
-  local anim = PIKAPIC[PIKAPIC_SCRIPT[emotion] or emotion] or PIKAPIC[1]
+  -- The chosen script's own base frame (its first pikapic_loadgfx, ripped as
+  -- pikachu/pikapic_N.png).  Red/Blue have no such art and Yellow caches
+  -- built before the rip do not carry it, so both fall back to the battle
+  -- front pic that stood in for every script before (#561).
+  local script = PIKAPIC_SCRIPT[emotion] or emotion
+  local pic = "assets/generated/pikachu/pikapic_" .. script .. ".png"
+  if not require("src.render.Assets").exists(pic) then
+    pic = Sprites.path(game.data, "PIKACHU", "front",
+                       { kind = "overworld" })
+  end
+  local anim = PIKAPIC[script] or PIKAPIC[1]
   local hold = anim.dur * PIKAPIC_TICK
   ow.emote = {
     npc = npc, frames = hold, bubble = bi or false, pikaPic = pic,
@@ -741,6 +756,80 @@ function PikachuFollower.picLift(emote)
   return 0
 end
 
+-- Bill's House has three map-scripted Yellow companion beats
+-- (BillsHouseScript0/2/5): Pikachu walks over to investigate Bill, waits at
+-- the cell separator, then reacts when Bill reappears.  Keep it at the
+-- machine until this map instance is discarded, just like the cartridge's
+-- disabled following state.
+local function billsHouseEmotion(game, ow, npc, bubble)
+  local Sprites = require("src.pokemon.Sprites")
+  ow.emote = {
+    npc = npc, frames = 50, bubble = bubbleIndex(game, bubble) or false,
+    pikaPic = Sprites.path(game.data, "PIKACHU", "front",
+                           { kind = "overworld" }),
+  }
+end
+
+local function movePikachu(ow, npc, steps, onDone)
+  npc.goalX, npc.goalY = nil, nil
+  idleReset(npc)
+  local function nextStep(i)
+    local step = steps[i]
+    if not step then
+      if onDone then onDone() end
+      return
+    end
+    ow:scriptMove(npc, step[1], step[2], function() nextStep(i + 1) end)
+  end
+  nextStep(1)
+end
+
+function PikachuFollower.onBillsHouseEnter(game, ow)
+  if not (GameVersion.isYellow() and ow.map and ow.map.id == "BILLS_HOUSE") then
+    return
+  end
+  if game.save.flags.EVENT_MET_BILL_2 then return end
+  local npc = findFollower(ow)
+  if not npc then return end
+  ow.pikachuBillsScene = true
+  movePikachu(ow, npc, { { "right", 3 }, { "up", 1 } }, function()
+    billsHouseEmotion(game, ow, npc, "QUESTION_BUBBLE")
+  end)
+end
+
+function PikachuFollower.onBillEnteredMachine(game, ow)
+  if not (GameVersion.isYellow() and ow.pikachuBillsScene) then return end
+  local npc = findFollower(ow)
+  if not npc then return end
+  -- BillsHouseScript3 (pokeyellow scripts/BillsHouse.asm:100-115).  The two
+  -- movement tables are named the wrong way round in the cartridge source:
+  -- hl is seeded with ..._EnterCellSeparatorDown, then
+  --   and a ; cp SPRITE_FACING_DOWN   (SPRITE_FACING_DOWN is 0)
+  --   jr nz, .applyPikachuMovement
+  -- keeps that seeded table when the player is NOT facing down, and only the
+  -- fallthrough -- facing down -- swaps in ..._EnterCellSeparatorNotDown.
+  -- So facing down takes the long way round the cell separator and every
+  -- other facing walks straight up.  Following the label names instead of the
+  -- branch inverts the scene (#455).
+  local steps = ow.player.facing == "down"
+      and { { "up", 1 }, { "left", 1 }, { "up", 2 }, { "right", 1 } }
+      or { { "up", 3 } }
+  movePikachu(ow, npc, steps, function()
+    -- PIKAMOVEMENT_LOOK_UP closes the detour table before the bubble
+    npc.facing = "up"
+    billsHouseEmotion(game, ow, npc, "QUESTION_BUBBLE")
+  end)
+end
+
+function PikachuFollower.onBillExitedMachine(game, ow)
+  if not (GameVersion.isYellow() and ow.pikachuBillsScene) then return end
+  local npc = findFollower(ow)
+  if not npc then return end
+  idleReset(npc)
+  npc.facing = "left"
+  billsHouseEmotion(game, ow, npc, "EXCLAMATION_BUBBLE")
+end
+
 -- ---------------------------------------------------------------------
 -- PikachuWalksToNurseJoy (engine/pikachu/pikachu_emotions.asm, run by
 -- engine/events/pokecenter.asm once the heal is accepted): the companion

src/world/Player.lua

@@ -12,10 +12,24 @@ local Player = {}
 Player.__index = Player
 
 local STEP_FRAMES = 16
--- a turn in place holds for the ~2 frames the original spends on the
--- extra OverworldLoop pass (home/overworld.asm .handleDirectionButtonPress
--- returns to the loop without moving after a direction change)
-local TURN_FRAMES = 2
+-- a turn in place blocks movement for the one extra OverworldLoop pass the
+-- original spends after a direction change: .handleDirectionButtonPress ends
+-- `jp OverworldLoop` (home/overworld.asm), and OverworldLoop burns two
+-- DelayFrame calls before the next JoypadOverworld, so the step can only
+-- commit at the following poll -- the same 2-frames-per-iteration cadence
+-- that makes STEP_FRAMES 16 above (wWalkCounter = 8, 2px per
+-- AdvancePlayerSprite).
+-- Those polls sit on a 2-frame grid, so the hardware samples a press 0 or 1
+-- frames after the d-pad physically goes down and the release deadline lands
+-- 2 or 3 frames after that.  We sample on the frame the button goes down
+-- with none of that poll latency, so a flat 2 handed every tap the tightest
+-- case the original could produce; 4 covers the grid instead of
+-- undercutting it (#415).
+local TURN_FRAMES = 4
+-- The on-screen d-pad cannot produce a 60ms tap: a finger press and release
+-- run well past it even before the OS batches the touch events, so the
+-- overlay gets a longer window than a physical pad (#415).
+local TOUCH_TURN_FRAMES = 8
 
 function Player.new(data, cx, cy, facing)
   local self = setmetatable({}, Player)
@@ -63,6 +77,11 @@ function Player.new(data, cx, cy, facing)
   self.progress = 0
   self.stepFlip = false
   self.turnTimer = 0
+  -- wCheckFor180DegreeTurn (home/overworld.asm): the original only lets a
+  -- turn in place happen on a poll whose previous pass found no direction
+  -- held.  It starts armed, tryMove spends it, and OverworldState:handleInput
+  -- re-arms it from a standstill.
+  self.turnArmed = true
   self.inputLocked = false
   return self
 end
@@ -71,14 +90,35 @@ function Player:position()
   return self.cellX, self.cellY
 end
 
+-- How long a fresh turn holds the step off for; see TURN_FRAMES.  The
+-- overlay is detected per source rather than by whether the touch controls
+-- are on screen, so a phone with a controller attached still gets the
+-- physical pad's window (Input:isTouchDown, src/core/Input.lua).
+function Player:turnWindow()
+  local frames = self.turnFrames or TURN_FRAMES
+  local input = require("src.core.Game").input
+  if input and input.isTouchDown and input:isTouchDown(self.facing) then
+    return math.max(frames, TOUCH_TURN_FRAMES)
+  end
+  return frames
+end
+
 -- Attempt to start a step; returns "moved"|"turned"|"blocked"|nil.
 function Player:tryMove(dir, map, entities)
   if self.moving or self.inputLocked then return nil end
   if self.facing ~= dir then
     self.facing = dir
-    self.turnTimer = self.turnFrames or TURN_FRAMES
     self.bumpFrames = nil -- turning to a new facing ends any wall-bonk cycle
-    return "turned"
+    -- .handleDirectionButtonPress only reaches the turn while
+    -- wCheckFor180DegreeTurn is still set, and .noDirectionButtonsPressed is
+    -- the one place that sets it (home/overworld.asm), so a facing change
+    -- made without the d-pad ever coming up steps straight away rather than
+    -- paying the turn delay at every corner (#415)
+    if self.turnArmed then
+      self.turnArmed = false
+      self.turnTimer = self:turnWindow()
+      return "turned"
+    end
   end
   if self.turnTimer > 0 then return nil end
   local ok, why = Collision.canMove(map, entities, self, dir)