diff --git a/scripts/build.sh b/scripts/build.sh
index 6b0489fa..7bd80bbb 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -60,34 +60,9 @@ mkdir -p "$CACHE" "$WORK" "$DIST/mac" "$DIST/win" "$DIST/linux"
 # launcher's Edit button on a save row opens it in-process (main.lua), and
 # `--editor` / POKEPORT_EDITOR=1 opens it standalone.  It is required through
 # love.filesystem's require path, so it has to live inside the archive.
-say "packing game.love"
 LOVE_FILE="$WORK/game.love"
-rm -f "$LOVE_FILE"
-(cd "$ROOT" && zip -q -9 -r "$LOVE_FILE" \
-  main.lua conf.lua src data assets tools/save-editor \
-  tools/rom_manifest.json tools/rom_manifest_blue.json \
-  tools/rom_manifest_yellow.json \
-  -x '*.DS_Store' 'data/generated/*' 'assets/generated/*')
-# Materialize the listing once. Piping unzip→grep -q under `set -o pipefail`
-# SIGPIPEs unzip when grep exits early on a match and aborts the build.
 LOVE_LIST="$WORK/love-listing.txt"
-unzip -Z1 "$LOVE_FILE" > "$LOVE_LIST"
-if grep -Eq '^(data|assets)/generated/[^/]+|^(data|assets)/generated/.+/' "$LOVE_LIST"; then
-  fail "game.love unexpectedly contains generated ROM data"
-fi
-# The editor is only reachable if its entry point and both module directories
-# made it in, and every version's import manifest has to ship or that game's
-# ROM import fails in the built app (dev reads them off the source tree, so
-# the miss only ever shows up in a build -- the Yellow manifest shipped this
-# way once).
-for required in tools/save-editor/App.lua tools/save-editor/Kit.lua \
-                tools/save-editor/panels/Party.lua \
-                tools/rom_manifest.json tools/rom_manifest_blue.json \
-                tools/rom_manifest_yellow.json; do
-  grep -qxF "$required" "$LOVE_LIST" \
-    || fail "game.love is missing $required"
-done
-say "game.love: $(du -h "$LOVE_FILE" | cut -f1)"
+LOVE_FILE="$("$ROOT/scripts/pack_love.sh" --output "$LOVE_FILE" --listing "$LOVE_LIST")"
 
 # ------------------------------------------------------- stamp release version
 # The working tree ships Version.lua with engine "0.0.0-dev"; the real release
diff --git a/scripts/pack_love.sh b/scripts/pack_love.sh
new file mode 100755
index 00000000..a2e87616
--- /dev/null
+++ b/scripts/pack_love.sh
@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+# Shared game.love packer for desktop and Switch builds.
+#
+# Usage:
+#   scripts/pack_love.sh [--output PATH] [--listing PATH] [--dry-run]
+#                       [--build-info PATH]
+#
+# Packs the same include/exclude set as the desktop release. Materializes a
+# listing file once and greps it (avoids SIGPIPE from unzip|grep under pipefail).
+#
+# --build-info PATH   copy JSON into the love archive root before verification
+# --dry-run           pack + verify only (for CI gates; no platform artifacts)
+
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+WORK="$ROOT/.bazinga/work"
+OUTPUT="$WORK/game.love"
+LISTING="$WORK/love-listing.txt"
+DRY_RUN=0
+BUILD_INFO=""
+
+say()  { printf '\033[1;32m==>\033[0m %s\n' "$*"; }
+fail() { printf '\033[1;31merror:\033[0m %s\n' "$*" >&2; exit 1; }
+
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --output) OUTPUT="$2"; shift 2 ;;
+    --listing) LISTING="$2"; shift 2 ;;
+    --build-info) BUILD_INFO="$2"; shift 2 ;;
+    --dry-run) DRY_RUN=1; shift ;;
+    -h|--help)
+      sed -n '2,12p' "$0" | sed 's/^# \{0,1\}//'
+      exit 0
+      ;;
+    *) fail "unknown argument: $1" ;;
+  esac
+done
+
+mkdir -p "$(dirname "$OUTPUT")" "$(dirname "$LISTING")"
+
+say "packing game.love"
+rm -f "$OUTPUT"
+(cd "$ROOT" && zip -q -9 -r "$OUTPUT" \
+  main.lua conf.lua src data assets tools/save-editor \
+  tools/rom_manifest.json tools/rom_manifest_blue.json \
+  tools/rom_manifest_yellow.json \
+  -x '*.DS_Store' 'data/generated/*' 'assets/generated/*')
+
+if [ -n "$BUILD_INFO" ]; then
+  [ -f "$BUILD_INFO" ] || fail "missing build-info: $BUILD_INFO"
+  [ "$(basename "$BUILD_INFO")" = "build-info.json" ] \
+    || fail "build-info file must be named build-info.json"
+  (cd "$(dirname "$BUILD_INFO")" && zip -q "$OUTPUT" build-info.json)
+fi
+
+# Materialize the listing once. Piping unzip→grep -q under `set -o pipefail`
+# SIGPIPEs unzip when grep exits early on a match and aborts the build.
+unzip -Z1 "$OUTPUT" > "$LISTING"
+if grep -Eq '^(data|assets)/generated/[^/]+|^(data|assets)/generated/.+/' "$LISTING"; then
+  fail "game.love unexpectedly contains generated ROM data"
+fi
+
+for required in tools/save-editor/App.lua tools/save-editor/Kit.lua \
+                tools/save-editor/panels/Party.lua \
+                tools/rom_manifest.json tools/rom_manifest_blue.json \
+                tools/rom_manifest_yellow.json; do
+  grep -qxF "$required" "$LISTING" \
+    || fail "game.love is missing $required"
+done
+
+if [ -n "$BUILD_INFO" ]; then
+  grep -qxF "build-info.json" "$LISTING" \
+    || fail "game.love is missing build-info.json"
+fi
+
+say "game.love: $(du -h "$OUTPUT" | cut -f1)"
+
+if [ "$DRY_RUN" -eq 1 ]; then
+  say "pack dry-run OK: $OUTPUT"
+fi
+
+printf '%s\n' "$OUTPUT"