diff --git a/apps/wolf_3d_gui/lib/screens/audio_gallery.dart b/apps/wolf_3d_gui/lib/screens/audio_gallery.dart
index 43ca7a6..a1925d9 100644
--- a/apps/wolf_3d_gui/lib/screens/audio_gallery.dart
+++ b/apps/wolf_3d_gui/lib/screens/audio_gallery.dart
@@ -46,74 +46,6 @@ class _AudioGalleryState extends State<AudioGallery> {
     return 2;
   }
 
-  static const List<SfxKey> _knownSfxKeys = [
-    SfxKey.openDoor,
-    SfxKey.closeDoor,
-    SfxKey.pushWall,
-    SfxKey.knifeAttack,
-    SfxKey.pistolFire,
-    SfxKey.machineGunFire,
-    SfxKey.chainGunFire,
-    SfxKey.enemyFire,
-    SfxKey.getMachineGun,
-    SfxKey.getAmmo,
-    SfxKey.getChainGun,
-    SfxKey.healthSmall,
-    SfxKey.healthLarge,
-    SfxKey.treasure1,
-    SfxKey.treasure2,
-    SfxKey.treasure3,
-    SfxKey.treasure4,
-    SfxKey.extraLife,
-    SfxKey.guardHalt,
-    SfxKey.dogBark,
-    SfxKey.dogDeath,
-    SfxKey.dogAttack,
-    SfxKey.deathScream1,
-    SfxKey.deathScream2,
-    SfxKey.deathScream3,
-    SfxKey.ssAlert,
-    SfxKey.ssDeath,
-    SfxKey.bossActive,
-    SfxKey.hansGrosseDeath,
-    SfxKey.schabbs,
-    SfxKey.schabbsDeath,
-    SfxKey.hitlerGreeting,
-    SfxKey.hitlerDeath,
-    SfxKey.mechaSteps,
-    SfxKey.ottoAlert,
-    SfxKey.gretelDeath,
-    SfxKey.levelComplete,
-    SfxKey.endBonus1,
-    SfxKey.endBonus2,
-    SfxKey.noBonus,
-    SfxKey.percent100,
-  ];
-
-  static const List<MusicKey> _knownMusicKeys = [
-    MusicKey.menuTheme,
-    MusicKey.level01,
-    MusicKey.level02,
-    MusicKey.level03,
-    MusicKey.level04,
-    MusicKey.level05,
-    MusicKey.level06,
-    MusicKey.level07,
-    MusicKey.level08,
-    MusicKey.level09,
-    MusicKey.level10,
-    MusicKey.level11,
-    MusicKey.level12,
-    MusicKey.level13,
-    MusicKey.level14,
-    MusicKey.level15,
-    MusicKey.level16,
-    MusicKey.level17,
-    MusicKey.level18,
-    MusicKey.level19,
-    MusicKey.level20,
-  ];
-
   @override
   void initState() {
     super.initState();
@@ -130,14 +62,14 @@ class _AudioGalleryState extends State<AudioGallery> {
 
   Map<int, List<String>> _buildSfxAliases() {
     final Map<int, Set<String>> aliasesById = {};
-    for (final key in _knownSfxKeys) {
+    for (final key in SoundEffect.values) {
       final ref = _selectedGame.registry.sfx.resolve(key);
       if (ref == null) {
         continue;
       }
       aliasesById
           .putIfAbsent(ref.slotIndex, () => <String>{})
-          .add(_readableKeyName(key.toString(), 'SfxKey('));
+          .add(_readableKeyName(key.name));
     }
 
     return aliasesById.map(
@@ -147,14 +79,14 @@ class _AudioGalleryState extends State<AudioGallery> {
 
   Map<int, List<String>> _buildMusicAliases() {
     final Map<int, Set<String>> aliasesById = {};
-    for (final key in _knownMusicKeys) {
+    for (final key in Music.values) {
       final route = _selectedGame.registry.music.resolve(key);
       if (route == null) {
         continue;
       }
       aliasesById
           .putIfAbsent(route.trackIndex, () => <String>{})
-          .add(_readableKeyName(key.toString(), 'MusicKey('));
+          .add(_readableKeyName(key.name));
     }
 
     return aliasesById.map(
@@ -162,15 +94,12 @@ class _AudioGalleryState extends State<AudioGallery> {
     );
   }
 
-  String _readableKeyName(String raw, String prefix) {
-    final String trimmed = raw.startsWith(prefix) && raw.endsWith(')')
-        ? raw.substring(prefix.length, raw.length - 1)
-        : raw;
-    if (trimmed.isEmpty) {
+  String _readableKeyName(String raw) {
+    if (raw.isEmpty) {
       return raw;
     }
 
-    return trimmed.replaceAllMapped(
+    return raw.replaceAllMapped(
       RegExp(r'([a-z0-9])([A-Z])'),
       (match) => '${match.group(1)} ${match.group(2)}',
     );
@@ -203,7 +132,7 @@ class _AudioGalleryState extends State<AudioGallery> {
   }
 
   void _playSfx(int id) {
-    widget.wolf3d.audio.playSoundEffect(id);
+    widget.wolf3d.audio.playSoundEffectId(id);
   }
 
   Future<void> _toggleMusic(int trackIndex) async {
diff --git a/packages/wolf_3d_dart/lib/src/data/wl_parser.dart b/packages/wolf_3d_dart/lib/src/data/wl_parser.dart
index 7bc11b4..52f1a19 100644
--- a/packages/wolf_3d_dart/lib/src/data/wl_parser.dart
+++ b/packages/wolf_3d_dart/lib/src/data/wl_parser.dart
@@ -13,20 +13,6 @@ import 'package:wolf_3d_dart/wolf_3d_data_types.dart';
 abstract class WLParser {
   static const int _areaTileBase = 107;
 
-  // --- Original Song Lookup Tables ---
-  static const List<int> _sharewareMusicMap = [
-    2, 3, 4, 5, 2, 3, 4, 5, 6, 7, // Episode 1
-  ];
-
-  static const List<int> _retailMusicMap = [
-    2, 3, 4, 5, 2, 3, 4, 5, 6, 7, // Ep 1
-    8, 9, 10, 11, 8, 9, 11, 10, 6, 12, // Ep 2
-    13, 14, 15, 16, 13, 14, 15, 16, 17, 18, // Ep 3
-    2, 3, 4, 5, 2, 3, 4, 5, 6, 7, // Ep 4
-    8, 9, 10, 11, 8, 9, 11, 10, 6, 12, // Ep 5
-    13, 14, 15, 16, 13, 14, 15, 16, 17, 19, // Ep 6
-  ];
-
   /// Asynchronously discovers the game version and loads all necessary files.
   ///
   /// Provide a [fileFetcher] callback (e.g., Flutter's `rootBundle.load` or
@@ -182,8 +168,6 @@ abstract class WLParser {
     required DataVersion dataIdentity,
     AssetRegistry? registryOverride,
   }) {
-    final isShareware = version == GameVersion.shareware;
-
     final audio = parseAudio(audioHed, audioT, version);
     final vgaImages = parseVgaImages(vgaDict, vgaHead, vgaGraph);
 
@@ -204,7 +188,7 @@ abstract class WLParser {
       walls: parseWalls(vswap),
       sprites: parseSprites(vswap),
       sounds: parseSounds(vswap).map((bytes) => PcmSound(bytes)).toList(),
-      episodes: parseEpisodes(mapHead, gameMaps, isShareware: isShareware),
+      episodes: parseEpisodes(mapHead, gameMaps, version: version),
       vgaImages: vgaImages,
       adLibSounds: audio.adLib,
       music: audio.music,
@@ -438,13 +422,12 @@ abstract class WLParser {
   static List<Episode> parseEpisodes(
     ByteData mapHead,
     ByteData gameMaps, {
-    bool isShareware = true,
+    required GameVersion version,
   }) {
     List<WolfLevel> allLevels = [];
     int rlewTag = mapHead.getUint16(0, Endian.little);
 
-    // Select the correct music map based on the version
-    final activeMusicMap = isShareware ? _sharewareMusicMap : _retailMusicMap;
+    final isShareware = version == GameVersion.shareware;
     final episodeNames = isShareware
         ? _sharewareEpisodeNames
         : _retailEpisodeNames;
@@ -510,9 +493,9 @@ abstract class WLParser {
       }
 
       // --- ASSIGN MUSIC ---
-      int trackIndex = (i < activeMusicMap.length)
-          ? activeMusicMap[i]
-          : activeMusicMap[i % activeMusicMap.length];
+      final episodeIndex = i ~/ 10;
+      final levelIndex = i % 10;
+      final levelMusic = Music.levelFor(version, episodeIndex, levelIndex);
 
       allLevels.add(
         WolfLevel(
@@ -520,7 +503,7 @@ abstract class WLParser {
           wallGrid: wallGrid,
           objectGrid: objectGrid,
           areaGrid: areaGrid,
-          musicIndex: trackIndex,
+          music: levelMusic,
         ),
       );
     }
diff --git a/packages/wolf_3d_dart/lib/src/data_types/sound.dart b/packages/wolf_3d_dart/lib/src/data_types/sound.dart
index fcdec1a..1bb3189 100644
--- a/packages/wolf_3d_dart/lib/src/data_types/sound.dart
+++ b/packages/wolf_3d_dart/lib/src/data_types/sound.dart
@@ -57,64 +57,3 @@ class ImfMusic {
     return ImfMusic(instructions);
   }
 }
-
-typedef WolfMusicMap = List<int>;
-
-/// Map indices to original sound effects as defined in the Wolfenstein 3D source.
-abstract class WolfSound {
-  // --- Doors & Environment ---
-  static const int openDoor = 8;
-  static const int closeDoor = 9;
-  static const int pushWall = 46; // Secret sliding walls
-
-  // --- Weapons & Combat ---
-  static const int knifeAttack = 23;
-  static const int pistolFire = 24;
-  static const int machineGunFire = 26;
-  static const int gatlingFire = 32; // Historically SHOOTSND in the source
-  static const int naziFire = 58; // Enemy gunshots
-
-  // --- Pickups & Items ---
-  static const int getMachineGun = 30;
-  static const int getAmmo = 31;
-  static const int getGatling = 38;
-  static const int healthSmall = 33; // Dog food / Meals
-  static const int healthLarge = 34; // First Aid
-  static const int treasure1 = 35; // Cross
-  static const int treasure2 = 36; // Chalice
-  static const int treasure3 = 37; // Chest
-  static const int treasure4 = 45; // Crown
-  static const int extraLife = 44; // 1-Up
-
-  // --- Enemies: Standard ---
-  static const int guardHalt = 21; // "Halt!"
-  static const int dogBark = 41;
-  static const int dogDeath = 62;
-  static const int dogAttack = 68;
-  static const int deathScream1 = 29;
-  static const int deathScream2 = 22;
-  static const int deathScream3 = 25;
-  static const int ssSchutzstaffel = 51; // "Schutzstaffel!"
-  static const int ssMeinGott = 63; // SS Death
-
-  // --- Enemies: Bosses (Retail Episodes 1-6) ---
-  static const int bossActive = 49;
-  static const int mutti = 50; // Hans Grosse Death
-  static const int ahhhg = 52;
-  static const int eva = 54; // Dr. Schabbs Death
-  static const int gutenTag = 55; // Hitler Greeting
-  static const int leben = 56;
-  static const int scheist = 57; // Hitler Death
-  static const int schabbsHas = 64; // Dr. Schabbs
-  static const int hitlerHas = 65;
-  static const int spion = 66; // Otto Giftmacher
-  static const int neinSoVass = 67; // Gretel Grosse Death
-  static const int mechSteps = 70; // Mecha-Hitler walking
-
-  // --- UI & Progression ---
-  static const int levelDone = 40;
-  static const int endBonus1 = 42;
-  static const int endBonus2 = 43;
-  static const int noBonus = 47;
-  static const int percent100 = 48;
-}
diff --git a/packages/wolf_3d_dart/lib/src/data_types/wolf_level.dart b/packages/wolf_3d_dart/lib/src/data_types/wolf_level.dart
index defa4ac..d95e917 100644
--- a/packages/wolf_3d_dart/lib/src/data_types/wolf_level.dart
+++ b/packages/wolf_3d_dart/lib/src/data_types/wolf_level.dart
@@ -22,14 +22,14 @@ class WolfLevel {
   /// zero-based and correspond to original AREATILE-derived sectors.
   final SpriteMap areaGrid;
 
-  /// The index of the [ImfMusic] track to play while this level is active.
-  final int musicIndex;
+  /// The [Music] track to play while this level is active.
+  final Music music;
 
   const WolfLevel({
     required this.name,
     required this.wallGrid,
     required this.objectGrid,
     required this.areaGrid,
-    required this.musicIndex,
+    required this.music,
   });
 }
diff --git a/packages/wolf_3d_dart/lib/src/data_types/wolfenstein_data.dart b/packages/wolf_3d_dart/lib/src/data_types/wolfenstein_data.dart
index 13b6f40..9af34d1 100644
--- a/packages/wolf_3d_dart/lib/src/data_types/wolfenstein_data.dart
+++ b/packages/wolf_3d_dart/lib/src/data_types/wolfenstein_data.dart
@@ -23,7 +23,7 @@ class WolfensteinData {
   ///
   /// Access the five sub-modules via:
   /// ```dart
-  /// data.registry.sfx.resolve(SfxKey.pistolFire)
+  /// data.registry.sfx.resolve(SoundEffect.pistolFire)
   /// data.registry.music.musicForLevel(episode, level)
   /// data.registry.entities.resolve(EntityKey.guard)
   /// data.registry.hud.faceForHealth(player.health)
diff --git a/packages/wolf_3d_dart/lib/src/engine/audio/engine_audio.dart b/packages/wolf_3d_dart/lib/src/engine/audio/engine_audio.dart
index ddd8cd8..de5b99e 100644
--- a/packages/wolf_3d_dart/lib/src/engine/audio/engine_audio.dart
+++ b/packages/wolf_3d_dart/lib/src/engine/audio/engine_audio.dart
@@ -4,10 +4,11 @@ abstract class EngineAudio {
   WolfensteinData? activeGame;
   Future<void> debugSoundTest();
   void playMenuMusic();
-  void playLevelMusic(WolfLevel level);
+  void playLevelMusic(Music music);
   void stopMusic();
   Future<void> stopAllAudio();
-  void playSoundEffect(int sfxId);
+  void playSoundEffect(SoundEffect effect);
+  void playSoundEffectId(int sfxId);
   Future<void> init();
   void dispose();
 }
diff --git a/packages/wolf_3d_dart/lib/src/engine/audio/silent_renderer.dart b/packages/wolf_3d_dart/lib/src/engine/audio/silent_renderer.dart
index 0fa90d5..b48d6a5 100644
--- a/packages/wolf_3d_dart/lib/src/engine/audio/silent_renderer.dart
+++ b/packages/wolf_3d_dart/lib/src/engine/audio/silent_renderer.dart
@@ -14,10 +14,7 @@ class CliSilentAudio implements EngineAudio {
   void playMenuMusic() {}
 
   @override
-  void playLevelMusic(WolfLevel level) {
-    // Optional: Print a log so you know it's working!
-    // debugPrint("🎵 Playing music for: ${level.name} 🎵");
-  }
+  void playLevelMusic(Music music) {}
 
   @override
   void stopMusic() {}
@@ -26,7 +23,14 @@ class CliSilentAudio implements EngineAudio {
   Future<void> stopAllAudio() async {}
 
   @override
-  void playSoundEffect(int sfxId) {
+  void playSoundEffect(SoundEffect effect) {
+    // Optional: You could use the terminal 'bell' character here
+    // to actually make a system beep when a sound plays!
+    // stdout.write('\x07');
+  }
+
+  @override
+  void playSoundEffectId(int sfxId) {
     // Optional: You could use the terminal 'bell' character here
     // to actually make a system beep when a sound plays!
     // stdout.write('\x07');
diff --git a/packages/wolf_3d_dart/lib/src/engine/managers/door_manager.dart b/packages/wolf_3d_dart/lib/src/engine/managers/door_manager.dart
index ab6fd6d..68f3206 100644
--- a/packages/wolf_3d_dart/lib/src/engine/managers/door_manager.dart
+++ b/packages/wolf_3d_dart/lib/src/engine/managers/door_manager.dart
@@ -15,7 +15,7 @@ class DoorManager {
 
   /// Callback used to trigger sound effects without tight coupling
   /// to a specific audio engine implementation.
-  final void Function(int sfxId) onPlaySound;
+  final void Function(SoundEffect effect) onPlaySound;
 
   static int _key(int x, int y) => ((y & 0xFFFF) << 16) | (x & 0xFFFF);
 
@@ -41,7 +41,7 @@ class DoorManager {
       final newState = door.update(elapsed.inMilliseconds);
 
       if (newState == DoorState.closing) {
-        onPlaySound(WolfSound.closeDoor);
+        onPlaySound(SoundEffect.closeDoor);
       }
     }
   }
@@ -60,7 +60,7 @@ class DoorManager {
 
     final int key = _key(targetX, targetY);
     if (doors.containsKey(key) && doors[key]!.interact()) {
-      onPlaySound(WolfSound.openDoor);
+      onPlaySound(SoundEffect.openDoor);
       log('[DEBUG] Player opened door at ($targetX, $targetY)');
       return (x: targetX, y: targetY);
     }
@@ -74,7 +74,7 @@ class DoorManager {
     // AI only interacts if the door is currently fully closed (offset == 0).
     if (doors.containsKey(key) && doors[key]!.offset == 0.0) {
       if (doors[key]!.interact()) {
-        onPlaySound(WolfSound.openDoor);
+        onPlaySound(SoundEffect.openDoor);
       }
     }
   }
diff --git a/packages/wolf_3d_dart/lib/src/engine/managers/pushwall_manager.dart b/packages/wolf_3d_dart/lib/src/engine/managers/pushwall_manager.dart
index 591cd70..49c11fd 100644
--- a/packages/wolf_3d_dart/lib/src/engine/managers/pushwall_manager.dart
+++ b/packages/wolf_3d_dart/lib/src/engine/managers/pushwall_manager.dart
@@ -23,7 +23,7 @@ class PushwallManager {
   PushwallManager({this.onPlaySound});
 
   /// Optional callback used to emit audio cues when pushwalls activate.
-  final void Function(int sfxId)? onPlaySound;
+  final void Function(SoundEffect effect)? onPlaySound;
 
   final Map<String, Pushwall> pushwalls = {};
   Pushwall? activePushwall;
@@ -127,7 +127,7 @@ class PushwallManager {
       int checkY = targetY + pw.dirY;
       if (wallGrid[checkY][checkX] == 0) {
         activePushwall = pw;
-        onPlaySound?.call(WolfSound.pushWall);
+        onPlaySound?.call(SoundEffect.pushWall);
       }
     }
   }
diff --git a/packages/wolf_3d_dart/lib/src/engine/player/player.dart b/packages/wolf_3d_dart/lib/src/engine/player/player.dart
index af0be1c..43a2570 100644
--- a/packages/wolf_3d_dart/lib/src/engine/player/player.dart
+++ b/packages/wolf_3d_dart/lib/src/engine/player/player.dart
@@ -147,7 +147,7 @@ class Player {
   /// Attempts to collect [item] and returns the SFX to play.
   ///
   /// Returns `null` when the item was not collected (for example: full health).
-  int? tryPickup(Collectible item) {
+  SoundEffect? tryPickup(Collectible item) {
     final effect = item.tryCollect(
       CollectiblePickupContext(
         health: health,
@@ -211,7 +211,7 @@ class Player {
       requestWeaponSwitch(weaponType);
     }
 
-    return effect.pickupSfxId;
+    return effect.pickupSoundEffect;
   }
 
   bool fire(int currentTime) {
diff --git a/packages/wolf_3d_dart/lib/src/engine/wolf_3d_engine_base.dart b/packages/wolf_3d_dart/lib/src/engine/wolf_3d_engine_base.dart
index fdf4c0b..63edd0b 100644
--- a/packages/wolf_3d_dart/lib/src/engine/wolf_3d_engine_base.dart
+++ b/packages/wolf_3d_dart/lib/src/engine/wolf_3d_engine_base.dart
@@ -35,10 +35,10 @@ class WolfEngine {
        _availableGames = availableGames ?? <WolfensteinData>[data!],
        audio = engineAudio ?? CliSilentAudio(),
        doorManager = DoorManager(
-         onPlaySound: (sfxId) => engineAudio?.playSoundEffect(sfxId),
+         onPlaySound: (effect) => engineAudio?.playSoundEffect(effect),
        ),
        pushwallManager = PushwallManager(
-         onPlaySound: (sfxId) => engineAudio?.playSoundEffect(sfxId),
+         onPlaySound: (effect) => engineAudio?.playSoundEffect(effect),
        ) {
     if (_availableGames.isEmpty) {
       throw StateError('WolfEngine requires at least one game data set.');
@@ -481,7 +481,7 @@ class WolfEngine {
 
     doorManager.initDoors(currentLevel);
     pushwallManager.initPushwalls(currentLevel, _objectLevel);
-    audio.playLevelMusic(activeLevel);
+    audio.playLevelMusic(activeLevel.music);
 
     // Spawn Player and Entities from the Object Grid
     bool playerSpawned = false;
@@ -540,7 +540,7 @@ class WolfEngine {
 
   /// Handles floor transitions, including the "Level 10" secret floor logic.
   void _onLevelCompleted({bool isSecretExit = false}) {
-    audio.playSoundEffect(WolfSound.levelDone);
+    audio.playSoundEffect(SoundEffect.levelComplete);
     audio.stopMusic();
     player
       ..hasGoldKey = false
@@ -679,7 +679,7 @@ class WolfEngine {
         if (entity.state == EntityState.dead &&
             entity.isDying &&
             !entity.hasPlayedDeathSound) {
-          audio.playSoundEffect(entity.deathSoundId);
+          audio.playSoundEffect(entity.deathSound);
           entity.hasPlayedDeathSound = true;
         }
 
@@ -787,9 +787,9 @@ class WolfEngine {
         }
       } else if (entity is Collectible) {
         if (player.position.distanceTo(entity.position) < 0.5) {
-          final pickupSfxId = player.tryPickup(entity);
-          if (pickupSfxId != null) {
-            audio.playSoundEffect(pickupSfxId);
+          final pickupSoundEffect = player.tryPickup(entity);
+          if (pickupSoundEffect != null) {
+            audio.playSoundEffect(pickupSoundEffect);
             itemsToRemove.add(entity);
           }
         }
@@ -826,7 +826,7 @@ class WolfEngine {
       }
 
       entity.isAlerted = true;
-      audio.playSoundEffect(entity.alertSoundId);
+      audio.playSoundEffect(entity.alertSound);
       log(
         '[DEBUG] Enemy #${entity.debugId} (${entity.type.name}) '
         'alerted by gunfire in area $area',
@@ -1007,10 +1007,10 @@ class WolfEngine {
 
   void _playPlayerWeaponSound() {
     final sfxId = switch (player.currentWeapon.type) {
-      WeaponType.knife => WolfSound.knifeAttack,
-      WeaponType.pistol => WolfSound.pistolFire,
-      WeaponType.machineGun => WolfSound.machineGunFire,
-      WeaponType.chainGun => WolfSound.gatlingFire,
+      WeaponType.knife => SoundEffect.knifeAttack,
+      WeaponType.pistol => SoundEffect.pistolFire,
+      WeaponType.machineGun => SoundEffect.machineGunFire,
+      WeaponType.chainGun => SoundEffect.chainGunFire,
     };
 
     audio.playSoundEffect(sfxId);
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/collectible.dart b/packages/wolf_3d_dart/lib/src/entities/entities/collectible.dart
index 13af19c..d04af03 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/collectible.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/collectible.dart
@@ -29,7 +29,7 @@ class CollectiblePickupEffect {
   final int ammoToAdd;
   final int scoreToAdd;
   final int extraLivesToAdd;
-  final int pickupSfxId;
+  final SoundEffect pickupSoundEffect;
   final bool grantGoldKey;
   final bool grantSilverKey;
   final WeaponType? grantWeapon;
@@ -40,7 +40,7 @@ class CollectiblePickupEffect {
     this.ammoToAdd = 0,
     this.scoreToAdd = 0,
     this.extraLivesToAdd = 0,
-    required this.pickupSfxId,
+    required this.pickupSoundEffect,
     this.grantGoldKey = false,
     this.grantSilverKey = false,
     this.grantWeapon,
@@ -49,7 +49,7 @@ class CollectiblePickupEffect {
 
   @override
   String toString() {
-    return 'CollectiblePickupEffect(healthToRestore: $healthToRestore, ammoToAdd: $ammoToAdd, scoreToAdd: $scoreToAdd, extraLivesToAdd: $extraLivesToAdd, pickupSfxId: $pickupSfxId, grantGoldKey: $grantGoldKey, grantSilverKey: $grantSilverKey, grantWeapon: $grantWeapon, requestWeaponSwitch: $requestWeaponSwitch)';
+    return 'CollectiblePickupEffect(healthToRestore: $healthToRestore, ammoToAdd: $ammoToAdd, scoreToAdd: $scoreToAdd, extraLivesToAdd: $extraLivesToAdd, pickupSoundEffect: $pickupSoundEffect, grantGoldKey: $grantGoldKey, grantSilverKey: $grantSilverKey, grantWeapon: $grantWeapon, requestWeaponSwitch: $requestWeaponSwitch)';
   }
 }
 
@@ -123,7 +123,9 @@ class HealthCollectible extends Collectible {
     final bool isFood = mapId == MapObject.food;
     return CollectiblePickupEffect(
       healthToRestore: isFood ? 10 : 25,
-      pickupSfxId: isFood ? WolfSound.healthSmall : WolfSound.healthLarge,
+      pickupSoundEffect: isFood
+          ? SoundEffect.healthSmall
+          : SoundEffect.healthLarge,
     );
   }
 }
@@ -149,7 +151,7 @@ class AmmoCollectible extends Collectible {
 
     return CollectiblePickupEffect(
       ammoToAdd: ammoAmount,
-      pickupSfxId: WolfSound.getAmmo,
+      pickupSoundEffect: SoundEffect.getAmmo,
       requestWeaponSwitch: shouldAutoswitchToPistol ? WeaponType.pistol : null,
     );
   }
@@ -172,7 +174,7 @@ class WeaponCollectible extends Collectible {
     if (mapId == MapObject.machineGun) {
       return const CollectiblePickupEffect(
         ammoToAdd: 6,
-        pickupSfxId: WolfSound.getMachineGun,
+        pickupSoundEffect: SoundEffect.getMachineGun,
         grantWeapon: WeaponType.machineGun,
         requestWeaponSwitch: WeaponType.machineGun,
       );
@@ -181,7 +183,7 @@ class WeaponCollectible extends Collectible {
     if (mapId == MapObject.chainGun) {
       return const CollectiblePickupEffect(
         ammoToAdd: 6,
-        pickupSfxId: WolfSound.getGatling,
+        pickupSoundEffect: SoundEffect.getChainGun,
         grantWeapon: WeaponType.chainGun,
         requestWeaponSwitch: WeaponType.chainGun,
       );
@@ -203,7 +205,7 @@ class KeyCollectible extends Collectible {
     if (mapId == MapObject.goldKey) {
       if (context.hasGoldKey) return null;
       return const CollectiblePickupEffect(
-        pickupSfxId: WolfSound.getAmmo,
+        pickupSoundEffect: SoundEffect.getAmmo,
         grantGoldKey: true,
       );
     }
@@ -211,7 +213,7 @@ class KeyCollectible extends Collectible {
     if (mapId == MapObject.silverKey) {
       if (context.hasSilverKey) return null;
       return const CollectiblePickupEffect(
-        pickupSfxId: WolfSound.getAmmo,
+        pickupSoundEffect: SoundEffect.getAmmo,
         grantSilverKey: true,
       );
     }
@@ -243,18 +245,18 @@ class TreasureCollectible extends Collectible {
         healthToRestore: 99,
         ammoToAdd: 25,
         extraLivesToAdd: 1,
-        pickupSfxId: WolfSound.extraLife,
+        pickupSoundEffect: SoundEffect.extraLife,
       );
     }
 
     return CollectiblePickupEffect(
       scoreToAdd: scoreValue,
-      pickupSfxId: switch (mapId) {
-        MapObject.cross => WolfSound.treasure1,
-        MapObject.chalice => WolfSound.treasure2,
-        MapObject.chest => WolfSound.treasure3,
-        MapObject.crown => WolfSound.treasure4,
-        _ => WolfSound.getAmmo,
+      pickupSoundEffect: switch (mapId) {
+        MapObject.cross => SoundEffect.treasure1,
+        MapObject.chalice => SoundEffect.treasure2,
+        MapObject.chest => SoundEffect.treasure3,
+        MapObject.crown => SoundEffect.treasure4,
+        _ => SoundEffect.getAmmo,
       },
     );
   }
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/bosses/hans_grosse.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/bosses/hans_grosse.dart
index 7d0f21c..d18873b 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/bosses/hans_grosse.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/bosses/hans_grosse.dart
@@ -12,13 +12,13 @@ class HansGrosse extends Enemy {
       throw UnimplementedError("Hans Grosse uses manual animation logic.");
 
   @override
-  int get alertSoundId => WolfSound.bossActive;
+  SoundEffect get alertSound => SoundEffect.bossActive;
 
   @override
-  int get attackSoundId => WolfSound.naziFire;
+  SoundEffect get attackSound => SoundEffect.enemyFire;
 
   @override
-  int get deathSoundId => WolfSound.mutti;
+  SoundEffect get deathSound => SoundEffect.hansGrosseDeath;
 
   @override
   int get scoreValue => 5000;
@@ -85,7 +85,7 @@ class HansGrosse extends Enemy {
     required bool Function(int area) isAreaConnectedToPlayer,
     required void Function(int damage) onDamagePlayer,
     required void Function(int x, int y) tryOpenDoor,
-    required void Function(int sfxId) onPlaySound,
+    required void Function(SoundEffect effect) onPlaySound,
   }) {
     Coordinate2D movement = const Coordinate2D(0, 0);
     double newAngle = angle;
@@ -102,7 +102,7 @@ class HansGrosse extends Enemy {
       isAreaConnectedToPlayer: isAreaConnectedToPlayer,
       baseReactionMs: 50,
     )) {
-      onPlaySound(alertSoundId);
+      onPlaySound(alertSound);
     }
 
     double distance = position.distanceTo(playerPosition);
@@ -151,7 +151,7 @@ class HansGrosse extends Enemy {
             setTics(10);
           } else if (currentFrame == 2) {
             spriteIndex = _baseSprite + 6; // Fire
-            onPlaySound(attackSoundId);
+            onPlaySound(attackSound);
             onDamagePlayer(damage);
             setTics(4);
           } else if (currentFrame == 3) {
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/dog.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/dog.dart
index e48bd61..4e3a1a4 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/dog.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/dog.dart
@@ -45,7 +45,7 @@ class Dog extends Enemy {
     required bool Function(int area) isAreaConnectedToPlayer,
     required void Function(int damage) onDamagePlayer,
     required void Function(int x, int y) tryOpenDoor,
-    required void Function(int sfxId) onPlaySound,
+    required void Function(SoundEffect effect) onPlaySound,
   }) {
     final previousState = state;
     Coordinate2D movement = const Coordinate2D(0, 0);
@@ -60,7 +60,7 @@ class Dog extends Enemy {
         areaAt: areaAt,
         isAreaConnectedToPlayer: isAreaConnectedToPlayer,
       )) {
-        onPlaySound(alertSoundId);
+        onPlaySound(alertSound);
       }
     }
 
@@ -72,7 +72,7 @@ class Dog extends Enemy {
         currentFrame++;
         // Phase 2: The actual bite
         if (currentFrame == 1) {
-          onPlaySound(attackSoundId);
+          onPlaySound(attackSound);
           final bool attackSuccessful =
               math.Random().nextDouble() < (180 / 256);
 
@@ -176,7 +176,9 @@ class Dog extends Enemy {
         // A movement magnitude threshold prevents accepting near-zero floating-
         // point residuals (e.g. cos(π/2) ≈ 6e-17) as valid movement.
         final double minEffective = currentMoveSpeed * 0.5;
-        final double currentDistanceToPlayer = position.distanceTo(playerPosition);
+        final double currentDistanceToPlayer = position.distanceTo(
+          playerPosition,
+        );
 
         int selectedCandidateIndex = -1;
         for (int i = 0; i < candidateAngles.length; i++) {
@@ -192,7 +194,8 @@ class Dog extends Enemy {
             tryOpenDoor: (x, y) {},
           );
 
-          if (candidateMovement.x.abs() + candidateMovement.y.abs() < minEffective) {
+          if (candidateMovement.x.abs() + candidateMovement.y.abs() <
+              minEffective) {
             continue;
           }
 
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy.dart
index 28eeeda..aa4ca14 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy.dart
@@ -55,16 +55,16 @@ abstract class Enemy extends Entity {
   EnemyType get type;
 
   /// The sound played when this enemy notices the player or hears combat.
-  int get alertSoundId => type.alertSoundId;
+  SoundEffect get alertSound => type.alertSound;
 
   /// The sound played when this enemy performs its attack animation.
-  int get attackSoundId => type.attackSoundId;
+  SoundEffect get attackSound => type.attackSound;
 
   /// The score awarded when this enemy is killed.
   int get scoreValue => type.scoreValue;
 
   /// The sound played once when this enemy starts dying.
-  int get deathSoundId => type.deathSoundId;
+  SoundEffect get deathSound => type.deathSound;
 
   /// Ensures enemies drop only one item (like ammo or a key) upon death.
   bool hasDroppedItem = false;
@@ -412,11 +412,19 @@ abstract class Enemy extends Entity {
         // is moving mostly north and clips a wall tile beside an open door, the
         // Y (northward) slide is preferred over the X (sideways) slide.
         if (intendedMovement.y.abs() >= intendedMovement.x.abs()) {
-          if (canMoveY) return normalizeTiny(Coordinate2D(0, intendedMovement.y));
-          if (canMoveX) return normalizeTiny(Coordinate2D(intendedMovement.x, 0));
+          if (canMoveY) {
+            return normalizeTiny(Coordinate2D(0, intendedMovement.y));
+          }
+          if (canMoveX) {
+            return normalizeTiny(Coordinate2D(intendedMovement.x, 0));
+          }
         } else {
-          if (canMoveX) return normalizeTiny(Coordinate2D(intendedMovement.x, 0));
-          if (canMoveY) return normalizeTiny(Coordinate2D(0, intendedMovement.y));
+          if (canMoveX) {
+            return normalizeTiny(Coordinate2D(intendedMovement.x, 0));
+          }
+          if (canMoveY) {
+            return normalizeTiny(Coordinate2D(0, intendedMovement.y));
+          }
         }
         return const Coordinate2D(0, 0);
       }
@@ -534,7 +542,7 @@ abstract class Enemy extends Entity {
     required bool Function(int area) isAreaConnectedToPlayer,
     required void Function(int x, int y) tryOpenDoor,
     required void Function(int damage) onDamagePlayer,
-    required void Function(int sfxId) onPlaySound,
+    required void Function(SoundEffect effect) onPlaySound,
   });
 
   /// Factory method to spawn the correct [Enemy] subclass based on a Map ID.
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy_type.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy_type.dart
index d37d694..a7a8dc9 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy_type.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/enemy_type.dart
@@ -11,9 +11,9 @@ enum EnemyType {
   guard(
     mapData: EnemyMapData(MapObject.guardStart),
     scoreValue: 100,
-    alertSoundId: WolfSound.guardHalt,
-    attackSoundId: WolfSound.naziFire,
-    deathSoundId: WolfSound.deathScream1,
+    alertSound: SoundEffect.guardHalt,
+    attackSound: SoundEffect.enemyFire,
+    deathSound: SoundEffect.deathScream1,
     animations: EnemyAnimationMap(
       idle: SpriteFrameRange(50, 57),
       walking: SpriteFrameRange(58, 89),
@@ -28,9 +28,9 @@ enum EnemyType {
   dog(
     mapData: EnemyMapData(MapObject.dogStart),
     scoreValue: 200,
-    alertSoundId: WolfSound.dogBark,
-    attackSoundId: WolfSound.dogAttack,
-    deathSoundId: WolfSound.dogDeath,
+    alertSound: SoundEffect.dogBark,
+    attackSound: SoundEffect.dogAttack,
+    deathSound: SoundEffect.dogDeath,
     animations: EnemyAnimationMap(
       // Dogs don't have true idle sprites, so map idle to the first walk frame safely
       idle: SpriteFrameRange(99, 106),
@@ -51,9 +51,9 @@ enum EnemyType {
   ss(
     mapData: EnemyMapData(MapObject.ssStart),
     scoreValue: 500,
-    alertSoundId: WolfSound.ssSchutzstaffel,
-    attackSoundId: WolfSound.naziFire,
-    deathSoundId: WolfSound.ssMeinGott,
+    alertSound: SoundEffect.ssAlert,
+    attackSound: SoundEffect.enemyFire,
+    deathSound: SoundEffect.ssDeath,
     animations: EnemyAnimationMap(
       idle: SpriteFrameRange(138, 145),
       walking: SpriteFrameRange(146, 177),
@@ -68,9 +68,9 @@ enum EnemyType {
   mutant(
     mapData: EnemyMapData(MapObject.mutantStart, tierOffset: 18),
     scoreValue: 700,
-    alertSoundId: WolfSound.guardHalt,
-    attackSoundId: WolfSound.naziFire,
-    deathSoundId: WolfSound.deathScream2,
+    alertSound: SoundEffect.guardHalt,
+    attackSound: SoundEffect.enemyFire,
+    deathSound: SoundEffect.deathScream2,
     animations: EnemyAnimationMap(
       idle: SpriteFrameRange(187, 194),
       walking: SpriteFrameRange(195, 226),
@@ -86,9 +86,9 @@ enum EnemyType {
   officer(
     mapData: EnemyMapData(MapObject.officerStart),
     scoreValue: 400,
-    alertSoundId: WolfSound.guardHalt,
-    attackSoundId: WolfSound.naziFire,
-    deathSoundId: WolfSound.deathScream3,
+    alertSound: SoundEffect.guardHalt,
+    attackSound: SoundEffect.enemyFire,
+    deathSound: SoundEffect.deathScream3,
     animations: EnemyAnimationMap(
       idle: SpriteFrameRange(238, 245),
       walking: SpriteFrameRange(246, 277),
@@ -111,13 +111,13 @@ enum EnemyType {
   final int scoreValue;
 
   /// The sound played when this enemy first becomes alerted.
-  final int alertSoundId;
+  final SoundEffect alertSound;
 
   /// The sound played when this enemy attacks.
-  final int attackSoundId;
+  final SoundEffect attackSound;
 
   /// The sound played when this enemy enters its death animation.
-  final int deathSoundId;
+  final SoundEffect deathSound;
 
   /// If false, this enemy type will be ignored when loading shareware data.
   final bool existsInShareware;
@@ -126,9 +126,9 @@ enum EnemyType {
     required this.mapData,
     required this.animations,
     required this.scoreValue,
-    required this.alertSoundId,
-    required this.attackSoundId,
-    required this.deathSoundId,
+    required this.alertSound,
+    required this.attackSound,
+    required this.deathSound,
     this.existsInShareware = true,
   });
 
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/guard.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/guard.dart
index a80db1f..74b8da3 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/guard.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/guard.dart
@@ -38,7 +38,7 @@ class Guard extends Enemy {
     required bool Function(int area) isAreaConnectedToPlayer,
     required void Function(int damage) onDamagePlayer,
     required void Function(int x, int y) tryOpenDoor,
-    required void Function(int sfxId) onPlaySound,
+    required void Function(SoundEffect effect) onPlaySound,
   }) {
     Coordinate2D movement = const Coordinate2D(0, 0);
     double newAngle = angle;
@@ -52,7 +52,7 @@ class Guard extends Enemy {
       areaAt: areaAt,
       isAreaConnectedToPlayer: isAreaConnectedToPlayer,
     )) {
-      onPlaySound(alertSoundId);
+      onPlaySound(alertSound);
     }
 
     // 2. Discrete AI Logic (Decisions happen every 10 tics)
@@ -62,7 +62,7 @@ class Guard extends Enemy {
       if (processTics(elapsedDeltaMs, moveSpeed: 0)) {
         currentFrame++;
         if (currentFrame == 1) {
-          onPlaySound(attackSoundId);
+          onPlaySound(attackSound);
           if (tryRollRangedHit(
             distance: distance,
             playerPosition: playerPosition,
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/mutant.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/mutant.dart
index 42d0893..88197e6 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/mutant.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/mutant.dart
@@ -36,7 +36,7 @@ class Mutant extends Enemy {
     required bool Function(int area) isAreaConnectedToPlayer,
     required void Function(int damage) onDamagePlayer,
     required void Function(int x, int y) tryOpenDoor,
-    required void Function(int sfxId) onPlaySound,
+    required void Function(SoundEffect effect) onPlaySound,
   }) {
     Coordinate2D movement = const Coordinate2D(0, 0);
     double newAngle = angle;
@@ -48,7 +48,7 @@ class Mutant extends Enemy {
       areaAt: areaAt,
       isAreaConnectedToPlayer: isAreaConnectedToPlayer,
     )) {
-      onPlaySound(alertSoundId);
+      onPlaySound(alertSound);
     }
 
     double distance = position.distanceTo(playerPosition);
@@ -122,7 +122,7 @@ class Mutant extends Enemy {
       if (processTics(elapsedDeltaMs, moveSpeed: 0)) {
         currentFrame++;
         if (currentFrame == 1) {
-          onPlaySound(attackSoundId);
+          onPlaySound(attackSound);
           if (tryRollRangedHit(
             distance: distance,
             playerPosition: playerPosition,
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/officer.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/officer.dart
index e18c463..8663d42 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/officer.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/officer.dart
@@ -36,7 +36,7 @@ class Officer extends Enemy {
     required bool Function(int area) isAreaConnectedToPlayer,
     required void Function(int damage) onDamagePlayer,
     required void Function(int x, int y) tryOpenDoor,
-    required void Function(int sfxId) onPlaySound,
+    required void Function(SoundEffect effect) onPlaySound,
   }) {
     Coordinate2D movement = const Coordinate2D(0, 0);
     double newAngle = angle;
@@ -48,7 +48,7 @@ class Officer extends Enemy {
       areaAt: areaAt,
       isAreaConnectedToPlayer: isAreaConnectedToPlayer,
     )) {
-      onPlaySound(alertSoundId);
+      onPlaySound(alertSound);
     }
 
     double distance = position.distanceTo(playerPosition);
@@ -122,7 +122,7 @@ class Officer extends Enemy {
       if (processTics(elapsedDeltaMs, moveSpeed: 0)) {
         currentFrame++;
         if (currentFrame == 1) {
-          onPlaySound(attackSoundId);
+          onPlaySound(attackSound);
           if (tryRollRangedHit(
             distance: distance,
             playerPosition: playerPosition,
diff --git a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/ss.dart b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/ss.dart
index ef1485f..c498248 100644
--- a/packages/wolf_3d_dart/lib/src/entities/entities/enemies/ss.dart
+++ b/packages/wolf_3d_dart/lib/src/entities/entities/enemies/ss.dart
@@ -35,7 +35,7 @@ class SS extends Enemy {
     required bool Function(int area) isAreaConnectedToPlayer,
     required void Function(int damage) onDamagePlayer,
     required void Function(int x, int y) tryOpenDoor,
-    required void Function(int sfxId) onPlaySound,
+    required void Function(SoundEffect effect) onPlaySound,
   }) {
     Coordinate2D movement = const Coordinate2D(0, 0);
     double newAngle = angle;
@@ -47,7 +47,7 @@ class SS extends Enemy {
       areaAt: areaAt,
       isAreaConnectedToPlayer: isAreaConnectedToPlayer,
     )) {
-      onPlaySound(alertSoundId);
+      onPlaySound(alertSound);
     }
 
     double distance = position.distanceTo(playerPosition);
@@ -121,7 +121,7 @@ class SS extends Enemy {
       if (processTics(elapsedDeltaMs, moveSpeed: 0)) {
         currentFrame++;
         if (currentFrame == 1) {
-          onPlaySound(attackSoundId);
+          onPlaySound(attackSound);
           if (tryRollRangedHit(
             distance: distance,
             playerPosition: playerPosition,
@@ -140,7 +140,7 @@ class SS extends Enemy {
             if (math.Random().nextDouble() > 0.5) {
               // 50% chance to burst
               currentFrame = 1;
-              onPlaySound(attackSoundId);
+              onPlaySound(attackSound);
               if (tryRollRangedHit(
                 distance: distance,
                 playerPosition: playerPosition,
diff --git a/packages/wolf_3d_dart/lib/src/registry/asset_registry.dart b/packages/wolf_3d_dart/lib/src/registry/asset_registry.dart
index f1bd5bd..3c8fd01 100644
--- a/packages/wolf_3d_dart/lib/src/registry/asset_registry.dart
+++ b/packages/wolf_3d_dart/lib/src/registry/asset_registry.dart
@@ -9,7 +9,7 @@ import 'package:wolf_3d_dart/src/registry/modules/sfx_module.dart';
 /// Access version-specific asset IDs through the five typed modules:
 ///
 /// ```dart
-/// data.registry.sfx.resolve(SfxKey.pistolFire)
+/// data.registry.sfx.resolve(SoundEffect.pistolFire)
 /// data.registry.music.musicForLevel(episode, level)
 /// data.registry.entities.resolve(EntityKey.guard)
 /// data.registry.hud.faceForHealth(player.health)
diff --git a/packages/wolf_3d_dart/lib/src/registry/built_in/built_in_music_module.dart b/packages/wolf_3d_dart/lib/src/registry/built_in/built_in_music_module.dart
new file mode 100644
index 0000000..9fa15ea
--- /dev/null
+++ b/packages/wolf_3d_dart/lib/src/registry/built_in/built_in_music_module.dart
@@ -0,0 +1,27 @@
+import 'package:wolf_3d_dart/src/data_types/game_version.dart';
+import 'package:wolf_3d_dart/src/registry/keys/music.dart';
+import 'package:wolf_3d_dart/src/registry/modules/music_module.dart';
+
+/// Built-in music router backed directly by [Music] metadata.
+class BuiltInMusicModule extends MusicModule {
+  const BuiltInMusicModule(this.version);
+
+  final GameVersion version;
+
+  @override
+  MusicRoute get menuMusic =>
+      MusicRoute(Music.menuTheme.trackIndexFor(version)!);
+
+  @override
+  MusicRoute musicForLevel(int episodeIndex, int levelIndex) {
+    return MusicRoute(
+      Music.trackIndexForLevel(version, episodeIndex, levelIndex)!,
+    );
+  }
+
+  @override
+  MusicRoute? resolve(Music key) {
+    final index = key.trackIndexFor(version);
+    return index != null ? MusicRoute(index) : null;
+  }
+}
diff --git a/packages/wolf_3d_dart/lib/src/registry/built_in/built_in_sfx_module.dart b/packages/wolf_3d_dart/lib/src/registry/built_in/built_in_sfx_module.dart
new file mode 100644
index 0000000..ee4ef49
--- /dev/null
+++ b/packages/wolf_3d_dart/lib/src/registry/built_in/built_in_sfx_module.dart
@@ -0,0 +1,13 @@
+import 'package:wolf_3d_dart/src/data_types/game_version.dart';
+import 'package:wolf_3d_dart/src/registry/keys/sound_effect.dart';
+import 'package:wolf_3d_dart/src/registry/modules/sfx_module.dart';
+
+/// Built-in sound-slot resolver backed directly by [SoundEffect] metadata.
+class BuiltInSfxModule extends SfxModule {
+  const BuiltInSfxModule(this.version);
+
+  final GameVersion version;
+
+  @override
+  SoundAssetRef? resolve(SoundEffect key) => SoundAssetRef(key.idFor(version));
+}
diff --git a/packages/wolf_3d_dart/lib/src/registry/built_in/retail_asset_registry.dart b/packages/wolf_3d_dart/lib/src/registry/built_in/retail_asset_registry.dart
index c7524f8..5496dae 100644
--- a/packages/wolf_3d_dart/lib/src/registry/built_in/retail_asset_registry.dart
+++ b/packages/wolf_3d_dart/lib/src/registry/built_in/retail_asset_registry.dart
@@ -1,20 +1,21 @@
+import 'package:wolf_3d_dart/src/data_types/game_version.dart';
 import 'package:wolf_3d_dart/src/registry/asset_registry.dart';
+import 'package:wolf_3d_dart/src/registry/built_in/built_in_music_module.dart';
+import 'package:wolf_3d_dart/src/registry/built_in/built_in_sfx_module.dart';
 import 'package:wolf_3d_dart/src/registry/built_in/retail_entity_module.dart';
 import 'package:wolf_3d_dart/src/registry/built_in/retail_hud_module.dart';
 import 'package:wolf_3d_dart/src/registry/built_in/retail_menu_module.dart';
-import 'package:wolf_3d_dart/src/registry/built_in/retail_music_module.dart';
-import 'package:wolf_3d_dart/src/registry/built_in/retail_sfx_module.dart';
 
 /// The canonical [AssetRegistry] for all retail Wolf3D releases.
 ///
 /// Composes the five retail built-in modules and preserves the original
-/// id Software asset layout exactly.  All other registries and tests that
+/// id Software asset layout exactly. All other registries and tests that
 /// need a stable reference should start from this factory.
 class RetailAssetRegistry extends AssetRegistry {
   RetailAssetRegistry()
     : super(
-        sfx: const RetailSfxModule(),
-        music: const RetailMusicModule(),
+        sfx: const BuiltInSfxModule(GameVersion.retail),
+        music: const BuiltInMusicModule(GameVersion.retail),
         entities: const RetailEntityModule(),
         hud: const RetailHudModule(),
         menu: const RetailMenuPicModule(),
diff --git a/packages/wolf_3d_dart/lib/src/registry/built_in/retail_music_module.dart b/packages/wolf_3d_dart/lib/src/registry/built_in/retail_music_module.dart
deleted file mode 100644
index d0908f5..0000000
--- a/packages/wolf_3d_dart/lib/src/registry/built_in/retail_music_module.dart
+++ /dev/null
@@ -1,62 +0,0 @@
-import 'package:wolf_3d_dart/src/registry/keys/music_key.dart';
-import 'package:wolf_3d_dart/src/registry/modules/music_module.dart';
-
-/// Built-in music module for all retail Wolf3D releases (v1.0, v1.1, v1.4).
-///
-/// Encodes the original id Software level-to-track routing table and sets
-/// track index 1 as the menu music, exactly matching the original engine.
-class RetailMusicModule extends MusicModule {
-  const RetailMusicModule();
-
-  // Original WL_INTER.C music table — 60 entries (6 episodes × 10 levels).
-  static const List<int> _levelMap = [
-    2, 3, 4, 5, 2, 3, 4, 5, 6, 7, // Episode 1
-    8, 9, 10, 11, 8, 9, 11, 10, 6, 12, // Episode 2
-    13, 14, 15, 16, 13, 14, 15, 16, 17, 18, // Episode 3
-    2, 3, 4, 5, 2, 3, 4, 5, 6, 7, // Episode 4
-    8, 9, 10, 11, 8, 9, 11, 10, 6, 12, // Episode 5
-    13, 14, 15, 16, 13, 14, 15, 16, 17, 19, // Episode 6
-  ];
-
-  // Named MusicKey → track index for keyed lookups.
-  static final Map<MusicKey, int> _named = {
-    MusicKey.menuTheme: 1,
-    MusicKey.level01: 2,
-    MusicKey.level02: 3,
-    MusicKey.level03: 4,
-    MusicKey.level04: 5,
-    MusicKey.level05: 6,
-    MusicKey.level06: 7,
-    MusicKey.level07: 8,
-    MusicKey.level08: 9,
-    MusicKey.level09: 10,
-    MusicKey.level10: 11,
-    MusicKey.level11: 12,
-    MusicKey.level12: 13,
-    MusicKey.level13: 14,
-    MusicKey.level14: 15,
-    MusicKey.level15: 16,
-    MusicKey.level16: 17,
-    MusicKey.level17: 18,
-    MusicKey.level18: 19,
-  };
-
-  @override
-  MusicRoute get menuMusic => const MusicRoute(1);
-
-  @override
-  MusicRoute musicForLevel(int episodeIndex, int levelIndex) {
-    final flat = episodeIndex * 10 + levelIndex;
-    if (flat >= 0 && flat < _levelMap.length) {
-      return MusicRoute(_levelMap[flat]);
-    }
-    // Wrap for custom episode counts beyond the built-in 6.
-    return MusicRoute(_levelMap[flat % _levelMap.length]);
-  }
-
-  @override
-  MusicRoute? resolve(MusicKey key) {
-    final index = _named[key];
-    return index != null ? MusicRoute(index) : null;
-  }
-}
diff --git a/packages/wolf_3d_dart/lib/src/registry/built_in/retail_sfx_module.dart b/packages/wolf_3d_dart/lib/src/registry/built_in/retail_sfx_module.dart
deleted file mode 100644
index 8e12cce..0000000
--- a/packages/wolf_3d_dart/lib/src/registry/built_in/retail_sfx_module.dart
+++ /dev/null
@@ -1,67 +0,0 @@
-import 'package:wolf_3d_dart/src/data_types/sound.dart';
-import 'package:wolf_3d_dart/src/registry/keys/sfx_key.dart';
-import 'package:wolf_3d_dart/src/registry/modules/sfx_module.dart';
-
-/// Built-in SFX module for all retail Wolf3D releases (v1.0, v1.1, v1.4).
-///
-/// Maps every [SfxKey] to the corresponding numeric slot from [WolfSound],
-/// preserving the original id Software audio index layout exactly.
-class RetailSfxModule extends SfxModule {
-  const RetailSfxModule();
-
-  static final Map<SfxKey, int> _slots = {
-    // --- Doors & Environment ---
-    SfxKey.openDoor: WolfSound.openDoor,
-    SfxKey.closeDoor: WolfSound.closeDoor,
-    SfxKey.pushWall: WolfSound.pushWall,
-    // --- Weapons ---
-    SfxKey.knifeAttack: WolfSound.knifeAttack,
-    SfxKey.pistolFire: WolfSound.pistolFire,
-    SfxKey.machineGunFire: WolfSound.machineGunFire,
-    SfxKey.chainGunFire: WolfSound.gatlingFire,
-    SfxKey.enemyFire: WolfSound.naziFire,
-    // --- Pickups ---
-    SfxKey.getMachineGun: WolfSound.getMachineGun,
-    SfxKey.getAmmo: WolfSound.getAmmo,
-    SfxKey.getChainGun: WolfSound.getGatling,
-    SfxKey.healthSmall: WolfSound.healthSmall,
-    SfxKey.healthLarge: WolfSound.healthLarge,
-    SfxKey.treasure1: WolfSound.treasure1,
-    SfxKey.treasure2: WolfSound.treasure2,
-    SfxKey.treasure3: WolfSound.treasure3,
-    SfxKey.treasure4: WolfSound.treasure4,
-    SfxKey.extraLife: WolfSound.extraLife,
-    // --- Standard Enemies ---
-    SfxKey.guardHalt: WolfSound.guardHalt,
-    SfxKey.dogBark: WolfSound.dogBark,
-    SfxKey.dogDeath: WolfSound.dogDeath,
-    SfxKey.dogAttack: WolfSound.dogAttack,
-    SfxKey.deathScream1: WolfSound.deathScream1,
-    SfxKey.deathScream2: WolfSound.deathScream2,
-    SfxKey.deathScream3: WolfSound.deathScream3,
-    SfxKey.ssAlert: WolfSound.ssSchutzstaffel,
-    SfxKey.ssDeath: WolfSound.ssMeinGott,
-    // --- Bosses ---
-    SfxKey.bossActive: WolfSound.bossActive,
-    SfxKey.hansGrosseDeath: WolfSound.mutti,
-    SfxKey.schabbs: WolfSound.schabbsHas,
-    SfxKey.schabbsDeath: WolfSound.eva,
-    SfxKey.hitlerGreeting: WolfSound.gutenTag,
-    SfxKey.hitlerDeath: WolfSound.scheist,
-    SfxKey.mechaSteps: WolfSound.mechSteps,
-    SfxKey.ottoAlert: WolfSound.spion,
-    SfxKey.gretelDeath: WolfSound.neinSoVass,
-    // --- UI & Progression ---
-    SfxKey.levelComplete: WolfSound.levelDone,
-    SfxKey.endBonus1: WolfSound.endBonus1,
-    SfxKey.endBonus2: WolfSound.endBonus2,
-    SfxKey.noBonus: WolfSound.noBonus,
-    SfxKey.percent100: WolfSound.percent100,
-  };
-
-  @override
-  SoundAssetRef? resolve(SfxKey key) {
-    final slot = _slots[key];
-    return slot != null ? SoundAssetRef(slot) : null;
-  }
-}
diff --git a/packages/wolf_3d_dart/lib/src/registry/built_in/shareware_asset_registry.dart b/packages/wolf_3d_dart/lib/src/registry/built_in/shareware_asset_registry.dart
index 61def58..8a5cc00 100644
--- a/packages/wolf_3d_dart/lib/src/registry/built_in/shareware_asset_registry.dart
+++ b/packages/wolf_3d_dart/lib/src/registry/built_in/shareware_asset_registry.dart
@@ -1,14 +1,15 @@
+import 'package:wolf_3d_dart/src/data_types/game_version.dart';
 import 'package:wolf_3d_dart/src/registry/asset_registry.dart';
-import 'package:wolf_3d_dart/src/registry/built_in/retail_sfx_module.dart';
+import 'package:wolf_3d_dart/src/registry/built_in/built_in_music_module.dart';
+import 'package:wolf_3d_dart/src/registry/built_in/built_in_sfx_module.dart';
 import 'package:wolf_3d_dart/src/registry/built_in/shareware_entity_module.dart';
 import 'package:wolf_3d_dart/src/registry/built_in/shareware_hud_module.dart';
 import 'package:wolf_3d_dart/src/registry/built_in/shareware_menu_module.dart';
-import 'package:wolf_3d_dart/src/registry/built_in/shareware_music_module.dart';
 
 /// The [AssetRegistry] for the Wolfenstein 3D v1.4 Shareware release.
 ///
-/// - SFX slots are identical to retail (same AUDIOT layout).
-/// - Music routing uses the 10-level shareware table.
+/// - SFX slots are resolved through version-aware [SoundEffect.idFor].
+/// - Music routing uses [Music.levelFor] for the 10-level shareware table.
 /// - Entity definitions are limited to the three shareware enemies.
 /// - HUD indices are shareware-aware and offset from retail layout.
 /// - Menu picture indices are resolved via runtime heuristic offset; call
@@ -17,8 +18,8 @@ import 'package:wolf_3d_dart/src/registry/built_in/shareware_music_module.dart';
 class SharewareAssetRegistry extends AssetRegistry {
   SharewareAssetRegistry({bool strictOriginalShareware = false})
     : super(
-        sfx: const RetailSfxModule(),
-        music: const SharewareMusicModule(),
+        sfx: const BuiltInSfxModule(GameVersion.shareware),
+        music: const BuiltInMusicModule(GameVersion.shareware),
         entities: const SharewareEntityModule(),
         hud: SharewareHudModule(
           useOriginalWl1Map: strictOriginalShareware,
diff --git a/packages/wolf_3d_dart/lib/src/registry/built_in/shareware_music_module.dart b/packages/wolf_3d_dart/lib/src/registry/built_in/shareware_music_module.dart
deleted file mode 100644
index 47a79ae..0000000
--- a/packages/wolf_3d_dart/lib/src/registry/built_in/shareware_music_module.dart
+++ /dev/null
@@ -1,49 +0,0 @@
-import 'package:wolf_3d_dart/src/registry/keys/music_key.dart';
-import 'package:wolf_3d_dart/src/registry/modules/music_module.dart';
-
-/// Built-in music module for the Wolfenstein 3D v1.4 Shareware release.
-///
-/// Uses the original id Software shareware level-to-track routing table
-/// (10 levels, 1 episode) as opposed to the 60-entry retail table.
-class SharewareMusicModule extends MusicModule {
-  const SharewareMusicModule();
-
-  // Original WL_INTER.C shareware music table (Episode 1 only).
-  static const List<int> _levelMap = [
-    2,
-    3,
-    4,
-    5,
-    2,
-    3,
-    4,
-    5,
-    6,
-    7,
-  ];
-
-  static final Map<MusicKey, int> _named = {
-    MusicKey.menuTheme: 1,
-    MusicKey.level01: 2,
-    MusicKey.level02: 3,
-    MusicKey.level03: 4,
-    MusicKey.level04: 5,
-    MusicKey.level05: 6,
-    MusicKey.level06: 7,
-  };
-
-  @override
-  MusicRoute get menuMusic => const MusicRoute(1);
-
-  @override
-  MusicRoute musicForLevel(int episodeIndex, int levelIndex) {
-    final flat = levelIndex % _levelMap.length;
-    return MusicRoute(_levelMap[flat]);
-  }
-
-  @override
-  MusicRoute? resolve(MusicKey key) {
-    final index = _named[key];
-    return index != null ? MusicRoute(index) : null;
-  }
-}
diff --git a/packages/wolf_3d_dart/lib/src/registry/keys/music.dart b/packages/wolf_3d_dart/lib/src/registry/keys/music.dart
new file mode 100644
index 0000000..8e3c030
--- /dev/null
+++ b/packages/wolf_3d_dart/lib/src/registry/keys/music.dart
@@ -0,0 +1,162 @@
+import 'package:wolf_3d_dart/src/data_types/game_version.dart';
+
+/// Canonical music identifiers used by built-in registries.
+enum Music {
+  // --- Menus & UI ---
+  menuTheme(retailTrackIndex: 1, sharewareTrackIndex: 1),
+
+  // --- Gameplay ---
+  // Generic level-slot keys used when routing by episode+floor index.
+  level01(retailTrackIndex: 2, sharewareTrackIndex: 2),
+  level02(retailTrackIndex: 3, sharewareTrackIndex: 3),
+  level03(retailTrackIndex: 4, sharewareTrackIndex: 4),
+  level04(retailTrackIndex: 5, sharewareTrackIndex: 5),
+  level05(retailTrackIndex: 6, sharewareTrackIndex: 6),
+  level06(retailTrackIndex: 7, sharewareTrackIndex: 7),
+  level07(retailTrackIndex: 8),
+  level08(retailTrackIndex: 9),
+  level09(retailTrackIndex: 10),
+  level10(retailTrackIndex: 11),
+  level11(retailTrackIndex: 12),
+  level12(retailTrackIndex: 13),
+  level13(retailTrackIndex: 14),
+  level14(retailTrackIndex: 15),
+  level15(retailTrackIndex: 16),
+  level16(retailTrackIndex: 17),
+  level17(retailTrackIndex: 18),
+  level18(retailTrackIndex: 19),
+  level19(),
+  level20(),
+  ;
+
+  const Music({this.retailTrackIndex, this.sharewareTrackIndex});
+
+  final int? retailTrackIndex;
+  final int? sharewareTrackIndex;
+
+  int? trackIndexFor(GameVersion version) {
+    switch (version) {
+      case GameVersion.shareware:
+        return sharewareTrackIndex;
+      case GameVersion.retail:
+      case GameVersion.spearOfDestiny:
+      case GameVersion.spearOfDestinyDemo:
+        return retailTrackIndex;
+    }
+  }
+
+  static Music levelFor(GameVersion version, int episodeIndex, int levelIndex) {
+    final route = switch (version) {
+      GameVersion.shareware => _sharewareLevelRoute,
+      GameVersion.retail ||
+      GameVersion.spearOfDestiny ||
+      GameVersion.spearOfDestinyDemo => _retailLevelRoute,
+    };
+
+    final flatIndex = switch (version) {
+      GameVersion.shareware => levelIndex,
+      GameVersion.retail ||
+      GameVersion.spearOfDestiny ||
+      GameVersion.spearOfDestinyDemo => episodeIndex * 10 + levelIndex,
+    };
+
+    final normalizedIndex = flatIndex >= 0
+        ? flatIndex % route.length
+        : (flatIndex % route.length + route.length) % route.length;
+
+    return route[normalizedIndex];
+  }
+
+  static int? trackIndexForLevel(
+    GameVersion version,
+    int episodeIndex,
+    int levelIndex,
+  ) {
+    return levelFor(version, episodeIndex, levelIndex).trackIndexFor(version);
+  }
+
+  static Music? fromTrackIndex(GameVersion version, int trackIndex) {
+    for (final music in values) {
+      if (music.trackIndexFor(version) == trackIndex) {
+        return music;
+      }
+    }
+    return null;
+  }
+
+  static const List<Music> _sharewareLevelRoute = [
+    level01,
+    level02,
+    level03,
+    level04,
+    level01,
+    level02,
+    level03,
+    level04,
+    level05,
+    level06,
+  ];
+
+  static const List<Music> _retailLevelRoute = [
+    level01,
+    level02,
+    level03,
+    level04,
+    level01,
+    level02,
+    level03,
+    level04,
+    level05,
+    level06,
+    level07,
+    level08,
+    level09,
+    level10,
+    level07,
+    level08,
+    level10,
+    level09,
+    level05,
+    level11,
+    level12,
+    level13,
+    level14,
+    level15,
+    level12,
+    level13,
+    level14,
+    level15,
+    level16,
+    level17,
+    level01,
+    level02,
+    level03,
+    level04,
+    level01,
+    level02,
+    level03,
+    level04,
+    level05,
+    level06,
+    level07,
+    level08,
+    level09,
+    level10,
+    level07,
+    level08,
+    level10,
+    level09,
+    level05,
+    level11,
+    level12,
+    level13,
+    level14,
+    level15,
+    level12,
+    level13,
+    level14,
+    level15,
+    level16,
+    level18,
+  ];
+}
diff --git a/packages/wolf_3d_dart/lib/src/registry/keys/music_key.dart b/packages/wolf_3d_dart/lib/src/registry/keys/music_key.dart
deleted file mode 100644
index 729d937..0000000
--- a/packages/wolf_3d_dart/lib/src/registry/keys/music_key.dart
+++ /dev/null
@@ -1,51 +0,0 @@
-/// Extensible typed key for music tracks.
-///
-/// Built-in Wolf3D music contexts are exposed as named static constants.
-/// Custom modules can define new keys with `const MusicKey('myTrack')`
-/// without modifying this class.
-///
-/// Example:
-/// ```dart
-/// registry.music.resolve(MusicKey.menuTheme)
-/// ```
-final class MusicKey {
-  const MusicKey(this._id);
-
-  final String _id;
-
-  // --- Menus & UI ---
-  static const menuTheme = MusicKey('menuTheme');
-
-  // --- Gameplay ---
-  // Generic level-slot keys used when routing by episode+floor index.
-  // The MusicModule maps these to actual IMF track indices.
-  static const level01 = MusicKey('level01');
-  static const level02 = MusicKey('level02');
-  static const level03 = MusicKey('level03');
-  static const level04 = MusicKey('level04');
-  static const level05 = MusicKey('level05');
-  static const level06 = MusicKey('level06');
-  static const level07 = MusicKey('level07');
-  static const level08 = MusicKey('level08');
-  static const level09 = MusicKey('level09');
-  static const level10 = MusicKey('level10');
-  static const level11 = MusicKey('level11');
-  static const level12 = MusicKey('level12');
-  static const level13 = MusicKey('level13');
-  static const level14 = MusicKey('level14');
-  static const level15 = MusicKey('level15');
-  static const level16 = MusicKey('level16');
-  static const level17 = MusicKey('level17');
-  static const level18 = MusicKey('level18');
-  static const level19 = MusicKey('level19');
-  static const level20 = MusicKey('level20');
-
-  @override
-  bool operator ==(Object other) => other is MusicKey && other._id == _id;
-
-  @override
-  int get hashCode => _id.hashCode;
-
-  @override
-  String toString() => 'MusicKey($_id)';
-}
diff --git a/packages/wolf_3d_dart/lib/src/registry/keys/sfx_key.dart b/packages/wolf_3d_dart/lib/src/registry/keys/sfx_key.dart
deleted file mode 100644
index 2f4c4ba..0000000
--- a/packages/wolf_3d_dart/lib/src/registry/keys/sfx_key.dart
+++ /dev/null
@@ -1,77 +0,0 @@
-/// Extensible typed key for sound effects.
-///
-/// Built-in Wolf3D sound effects are exposed as named static constants.
-/// Custom modules can define new keys with `const SfxKey('myCustomId')`
-/// without modifying this class.
-///
-/// Example:
-/// ```dart
-/// registry.sfx.resolve(SfxKey.pistolFire)
-/// ```
-final class SfxKey {
-  const SfxKey(this._id);
-
-  final String _id;
-
-  // --- Doors & Environment ---
-  static const openDoor = SfxKey('openDoor');
-  static const closeDoor = SfxKey('closeDoor');
-  static const pushWall = SfxKey('pushWall');
-
-  // --- Weapons ---
-  static const knifeAttack = SfxKey('knifeAttack');
-  static const pistolFire = SfxKey('pistolFire');
-  static const machineGunFire = SfxKey('machineGunFire');
-  static const chainGunFire = SfxKey('chainGunFire');
-  static const enemyFire = SfxKey('enemyFire');
-
-  // --- Pickups ---
-  static const getMachineGun = SfxKey('getMachineGun');
-  static const getAmmo = SfxKey('getAmmo');
-  static const getChainGun = SfxKey('getChainGun');
-  static const healthSmall = SfxKey('healthSmall');
-  static const healthLarge = SfxKey('healthLarge');
-  static const treasure1 = SfxKey('treasure1');
-  static const treasure2 = SfxKey('treasure2');
-  static const treasure3 = SfxKey('treasure3');
-  static const treasure4 = SfxKey('treasure4');
-  static const extraLife = SfxKey('extraLife');
-
-  // --- Standard Enemies ---
-  static const guardHalt = SfxKey('guardHalt');
-  static const dogBark = SfxKey('dogBark');
-  static const dogDeath = SfxKey('dogDeath');
-  static const dogAttack = SfxKey('dogAttack');
-  static const deathScream1 = SfxKey('deathScream1');
-  static const deathScream2 = SfxKey('deathScream2');
-  static const deathScream3 = SfxKey('deathScream3');
-  static const ssAlert = SfxKey('ssAlert');
-  static const ssDeath = SfxKey('ssDeath');
-
-  // --- Bosses ---
-  static const bossActive = SfxKey('bossActive');
-  static const hansGrosseDeath = SfxKey('hansGrosseDeath');
-  static const schabbs = SfxKey('schabbs');
-  static const schabbsDeath = SfxKey('schabbsDeath');
-  static const hitlerGreeting = SfxKey('hitlerGreeting');
-  static const hitlerDeath = SfxKey('hitlerDeath');
-  static const mechaSteps = SfxKey('mechaSteps');
-  static const ottoAlert = SfxKey('ottoAlert');
-  static const gretelDeath = SfxKey('gretelDeath');
-
-  // --- UI & Progression ---
-  static const levelComplete = SfxKey('levelComplete');
-  static const endBonus1 = SfxKey('endBonus1');
-  static const endBonus2 = SfxKey('endBonus2');
-  static const noBonus = SfxKey('noBonus');
-  static const percent100 = SfxKey('percent100');
-
-  @override
-  bool operator ==(Object other) => other is SfxKey && other._id == _id;
-
-  @override
-  int get hashCode => _id.hashCode;
-
-  @override
-  String toString() => 'SfxKey($_id)';
-}
diff --git a/packages/wolf_3d_dart/lib/src/registry/keys/sound_effect.dart b/packages/wolf_3d_dart/lib/src/registry/keys/sound_effect.dart
new file mode 100644
index 0000000..e6c20d5
--- /dev/null
+++ b/packages/wolf_3d_dart/lib/src/registry/keys/sound_effect.dart
@@ -0,0 +1,75 @@
+import 'package:wolf_3d_dart/src/data_types/game_version.dart';
+
+/// Canonical sound-effect identifiers used by built-in registries.
+enum SoundEffect {
+  // --- Doors & Environment ---
+  openDoor(retailId: 8),
+  closeDoor(retailId: 9),
+  pushWall(retailId: 46),
+
+  // --- Weapons ---
+  knifeAttack(retailId: 23),
+  pistolFire(retailId: 24),
+  machineGunFire(retailId: 26),
+  chainGunFire(retailId: 32),
+  enemyFire(retailId: 58),
+
+  // --- Pickups ---
+  getMachineGun(retailId: 30),
+  getAmmo(retailId: 31),
+  getChainGun(retailId: 38),
+  healthSmall(retailId: 33),
+  healthLarge(retailId: 34),
+  treasure1(retailId: 35),
+  treasure2(retailId: 36),
+  treasure3(retailId: 37),
+  treasure4(retailId: 45),
+  extraLife(retailId: 44),
+
+  // --- Standard Enemies ---
+  guardHalt(retailId: 21),
+  dogBark(retailId: 41),
+  dogDeath(retailId: 62),
+  dogAttack(retailId: 68),
+  deathScream1(retailId: 29),
+  deathScream2(retailId: 22),
+  deathScream3(retailId: 25),
+  ssAlert(retailId: 51),
+  ssDeath(retailId: 63),
+
+  // --- Bosses ---
+  bossActive(retailId: 49),
+  hansGrosseDeath(retailId: 50),
+  schabbs(retailId: 64),
+  schabbsDeath(retailId: 54),
+  hitlerGreeting(retailId: 55),
+  hitlerDeath(retailId: 57),
+  mechaSteps(retailId: 70),
+  ottoAlert(retailId: 66),
+  gretelDeath(retailId: 67),
+
+  // --- UI & Progression ---
+  levelComplete(retailId: 40),
+  endBonus1(retailId: 42),
+  endBonus2(retailId: 43),
+  noBonus(retailId: 47),
+  percent100(retailId: 48),
+  ;
+
+  const SoundEffect({required this.retailId, int? sharewareId})
+    : sharewareId = sharewareId ?? retailId;
+
+  final int retailId;
+  final int sharewareId;
+
+  int idFor(GameVersion version) {
+    switch (version) {
+      case GameVersion.shareware:
+        return sharewareId;
+      case GameVersion.retail:
+      case GameVersion.spearOfDestiny:
+      case GameVersion.spearOfDestinyDemo:
+        return retailId;
+    }
+  }
+}
diff --git a/packages/wolf_3d_dart/lib/src/registry/modules/music_module.dart b/packages/wolf_3d_dart/lib/src/registry/modules/music_module.dart
index e228991..b959df0 100644
--- a/packages/wolf_3d_dart/lib/src/registry/modules/music_module.dart
+++ b/packages/wolf_3d_dart/lib/src/registry/modules/music_module.dart
@@ -1,4 +1,4 @@
-import 'package:wolf_3d_dart/src/registry/keys/music_key.dart';
+import 'package:wolf_3d_dart/src/registry/keys/music.dart';
 
 /// The resolved reference for a music track: a numeric index into
 /// [WolfensteinData.music].
@@ -19,10 +19,10 @@ class MusicRoute {
 abstract class MusicModule {
   const MusicModule();
 
-  /// Resolves a named [MusicKey] to a [MusicRoute].
+  /// Resolves a named [Music] to a [MusicRoute].
   ///
   /// Returns `null` if the key is not supported by this module.
-  MusicRoute? resolve(MusicKey key);
+  MusicRoute? resolve(Music key);
 
   /// Resolves the level music track for a given [episodeIndex] and
   /// zero-based [levelIndex].
diff --git a/packages/wolf_3d_dart/lib/src/registry/modules/sfx_module.dart b/packages/wolf_3d_dart/lib/src/registry/modules/sfx_module.dart
index 2eee8f9..0d1df1a 100644
--- a/packages/wolf_3d_dart/lib/src/registry/modules/sfx_module.dart
+++ b/packages/wolf_3d_dart/lib/src/registry/modules/sfx_module.dart
@@ -1,4 +1,4 @@
-import 'package:wolf_3d_dart/src/registry/keys/sfx_key.dart';
+import 'package:wolf_3d_dart/src/registry/keys/sound_effect.dart';
 
 /// The resolved reference for a sound effect: a numeric slot index into
 /// [WolfensteinData.sounds].
@@ -11,7 +11,7 @@ class SoundAssetRef {
   String toString() => 'SoundAssetRef($slotIndex)';
 }
 
-/// Owns the mapping from symbolic [SfxKey] identifiers to numeric sound slots.
+/// Owns the mapping from symbolic [SoundEffect] identifiers to numeric sound slots.
 ///
 /// Implement this class to provide a custom sound layout for a modded or
 /// alternate game version. Pass the implementation inside a custom
@@ -22,5 +22,5 @@ abstract class SfxModule {
   /// Resolves [key] to a [SoundAssetRef] containing the numeric slot index.
   ///
   /// Returns `null` if the key is not supported by this module.
-  SoundAssetRef? resolve(SfxKey key);
+  SoundAssetRef? resolve(SoundEffect key);
 }
diff --git a/packages/wolf_3d_dart/lib/src/synth/wolf_3d_audio.dart b/packages/wolf_3d_dart/lib/src/synth/wolf_3d_audio.dart
index a9ba049..b43e140 100644
--- a/packages/wolf_3d_dart/lib/src/synth/wolf_3d_audio.dart
+++ b/packages/wolf_3d_dart/lib/src/synth/wolf_3d_audio.dart
@@ -13,7 +13,7 @@ class WolfAudio implements EngineAudio {
     for (int i = 0; i < 50; i++) {
       Future.delayed(Duration(seconds: i * 2), () {
         log("[AUDIO] Testing Sound ID: $i");
-        playSoundEffect(i);
+        playSoundEffectId(i);
       });
     }
   }
@@ -122,16 +122,21 @@ class WolfAudio implements EngineAudio {
   @override
   Future<void> playMenuMusic() async {
     final data = activeGame;
-    if (data == null || data.music.length <= 1) return;
-    await playMusic(data.music[1]);
+    final trackIndex = data == null
+        ? null
+        : Music.menuTheme.trackIndexFor(data.version);
+    if (data == null || trackIndex == null || trackIndex >= data.music.length) {
+      return;
+    }
+    await playMusic(data.music[trackIndex]);
   }
 
   @override
-  Future<void> playLevelMusic(WolfLevel level) async {
+  Future<void> playLevelMusic(Music music) async {
     final data = activeGame;
     if (data == null || data.music.isEmpty) return;
 
-    final index = level.musicIndex;
+    final index = music.trackIndexFor(data.version) ?? 0;
     if (index < data.music.length) {
       await playMusic(data.music[index]);
     } else {
@@ -144,14 +149,24 @@ class WolfAudio implements EngineAudio {
   // ==========================================
 
   @override
-  Future<void> playSoundEffect(int sfxId) async {
+  Future<void> playSoundEffect(SoundEffect effect) async {
+    final data = activeGame;
+    if (data == null) return;
+    await playSoundEffectId(effect.idFor(data.version));
+  }
+
+  @override
+  Future<void> playSoundEffectId(int sfxId) async {
     log("[AUDIO] Playing sfx id $sfxId");
     // The original engine uses a specific starting chunk for digitized sounds.
     // In many loaders, the 'sounds' list is already just the digitized ones.
     // If your list contains EVERYTHING, you need to add the offset (174).
     // If it's JUST digitized sounds, sfxId should work directly.
 
-    final soundsList = activeGame!.sounds;
+    final data = activeGame;
+    if (data == null) return;
+
+    final soundsList = data.sounds;
     if (sfxId < 0 || sfxId >= soundsList.length) return;
 
     final raw8bitBytes = soundsList[sfxId].bytes;
diff --git a/packages/wolf_3d_dart/lib/wolf_3d_data_types.dart b/packages/wolf_3d_dart/lib/wolf_3d_data_types.dart
index 0e1b4e2..d4c14f2 100644
--- a/packages/wolf_3d_dart/lib/wolf_3d_data_types.dart
+++ b/packages/wolf_3d_dart/lib/wolf_3d_data_types.dart
@@ -19,8 +19,7 @@ export 'src/data_types/game_file.dart' show GameFile;
 export 'src/data_types/game_version.dart' show GameVersion;
 export 'src/data_types/image.dart' show VgaImage;
 export 'src/data_types/map_objects.dart' show MapObject;
-export 'src/data_types/sound.dart'
-    show PcmSound, ImfMusic, ImfInstruction, WolfMusicMap, WolfSound;
+export 'src/data_types/sound.dart' show PcmSound, ImfMusic, ImfInstruction;
 export 'src/data_types/sprite.dart' hide Matrix;
 export 'src/data_types/sprite_frame_range.dart' show SpriteFrameRange;
 export 'src/data_types/wolf_level.dart' show WolfLevel;
@@ -34,8 +33,8 @@ export 'src/registry/built_in/shareware_asset_registry.dart'
 export 'src/registry/keys/entity_key.dart' show EntityKey;
 export 'src/registry/keys/hud_key.dart' show HudKey;
 export 'src/registry/keys/menu_pic_key.dart' show MenuPicKey;
-export 'src/registry/keys/music_key.dart' show MusicKey;
-export 'src/registry/keys/sfx_key.dart' show SfxKey;
+export 'src/registry/keys/music.dart' show Music;
+export 'src/registry/keys/sound_effect.dart' show SoundEffect;
 export 'src/registry/modules/entity_asset_module.dart'
     show EntityAssetModule, EntityAssetDefinition;
 export 'src/registry/modules/hud_module.dart' show HudModule, HudAssetRef;
diff --git a/packages/wolf_3d_dart/test/engine/audio_events_test.dart b/packages/wolf_3d_dart/test/engine/audio_events_test.dart
index 4c32243..a173296 100644
--- a/packages/wolf_3d_dart/test/engine/audio_events_test.dart
+++ b/packages/wolf_3d_dart/test/engine/audio_events_test.dart
@@ -25,7 +25,7 @@ void main() {
       );
       engine.tick(const Duration(milliseconds: 16));
 
-      expect(audio.sfxIds, contains(WolfSound.getAmmo));
+      expect(audio.sfxIds, contains(SoundEffect.getAmmo));
     });
 
     test('plays guard alert when guard notices player', () {
@@ -47,7 +47,7 @@ void main() {
         engine.tick(const Duration(milliseconds: 16));
       }
 
-      expect(audio.sfxIds, contains(WolfSound.guardHalt));
+      expect(audio.sfxIds, contains(SoundEffect.guardHalt));
     });
 
     test('plays dog death sound when dog dies', () {
@@ -69,7 +69,7 @@ void main() {
 
       engine.tick(const Duration(milliseconds: 16));
 
-      expect(audio.sfxIds, contains(WolfSound.dogDeath));
+      expect(audio.sfxIds, contains(SoundEffect.dogDeath));
     });
 
     test('plays pushwall sound when triggering a secret wall', () {
@@ -90,7 +90,7 @@ void main() {
       engine.init();
       engine.tick(const Duration(milliseconds: 16));
 
-      expect(audio.sfxIds, contains(WolfSound.pushWall));
+      expect(audio.sfxIds, contains(SoundEffect.pushWall));
     });
   });
 }
@@ -134,7 +134,7 @@ WolfEngine _buildEngine({
               wallGrid: wallGrid,
               areaGrid: List.generate(64, (_) => List.filled(64, -1)),
               objectGrid: objectGrid,
-              musicIndex: 0,
+              music: Music.level01,
             ),
           ],
         ),
@@ -159,7 +159,7 @@ class _CapturingAudio implements EngineAudio {
   @override
   WolfensteinData? activeGame;
 
-  final List<int> sfxIds = [];
+  final List<SoundEffect> sfxIds = [];
 
   @override
   Future<void> debugSoundTest() async {}
@@ -168,14 +168,24 @@ class _CapturingAudio implements EngineAudio {
   Future<void> init() async {}
 
   @override
-  void playLevelMusic(WolfLevel level) {}
+  void playLevelMusic(Music music) {}
 
   @override
   void playMenuMusic() {}
 
   @override
-  void playSoundEffect(int sfxId) {
-    sfxIds.add(sfxId);
+  void playSoundEffect(SoundEffect effect) {
+    sfxIds.add(effect);
+  }
+
+  @override
+  void playSoundEffectId(int sfxId) {
+    final effect = SoundEffect.values
+        .where((entry) => entry.retailId == sfxId)
+        .firstOrNull;
+    if (effect != null) {
+      sfxIds.add(effect);
+    }
   }
 
   @override
diff --git a/packages/wolf_3d_dart/test/engine/enemy_drop_parity_test.dart b/packages/wolf_3d_dart/test/engine/enemy_drop_parity_test.dart
index e7bc871..e256f27 100644
--- a/packages/wolf_3d_dart/test/engine/enemy_drop_parity_test.dart
+++ b/packages/wolf_3d_dart/test/engine/enemy_drop_parity_test.dart
@@ -88,7 +88,7 @@ WolfEngine _buildEngine() {
               wallGrid: wallGrid,
               areaGrid: List.generate(64, (_) => List.filled(64, -1)),
               objectGrid: objectGrid,
-              musicIndex: 0,
+              music: Music.level01,
             ),
           ],
         ),
@@ -119,13 +119,16 @@ class _SilentAudio implements EngineAudio {
   Future<void> init() async {}
 
   @override
-  void playLevelMusic(WolfLevel level) {}
+  void playLevelMusic(Music music) {}
 
   @override
   void playMenuMusic() {}
 
   @override
-  void playSoundEffect(int sfxId) {}
+  void playSoundEffect(SoundEffect effect) {}
+
+  @override
+  void playSoundEffectId(int sfxId) {}
 
   @override
   void stopMusic() {}
diff --git a/packages/wolf_3d_dart/test/engine/level_state_and_pause_menu_test.dart b/packages/wolf_3d_dart/test/engine/level_state_and_pause_menu_test.dart
index d369dc2..2ee618f 100644
--- a/packages/wolf_3d_dart/test/engine/level_state_and_pause_menu_test.dart
+++ b/packages/wolf_3d_dart/test/engine/level_state_and_pause_menu_test.dart
@@ -365,14 +365,14 @@ WolfensteinData _buildTestData({required GameVersion gameVersion}) {
             wallGrid: levelOneWalls,
             areaGrid: List.generate(64, (_) => List.filled(64, -1)),
             objectGrid: levelOneObjects,
-            musicIndex: 0,
+            music: Music.level01,
           ),
           WolfLevel(
             name: 'Level 2',
             wallGrid: levelTwoWalls,
             areaGrid: List.generate(64, (_) => List.filled(64, -1)),
             objectGrid: levelTwoObjects,
-            musicIndex: 1,
+            music: Music.level02,
           ),
         ],
       ),
@@ -396,13 +396,16 @@ class _SilentAudio implements EngineAudio {
   Future<void> init() async {}
 
   @override
-  void playLevelMusic(WolfLevel level) {}
+  void playLevelMusic(Music music) {}
 
   @override
   void playMenuMusic() {}
 
   @override
-  void playSoundEffect(int sfxId) {}
+  void playSoundEffect(SoundEffect effect) {}
+
+  @override
+  void playSoundEffectId(int sfxId) {}
 
   @override
   void stopMusic() {}
diff --git a/packages/wolf_3d_dart/test/rasterizer/pushwall_rasterizer_test.dart b/packages/wolf_3d_dart/test/rasterizer/pushwall_rasterizer_test.dart
index 51bde6c..f4d7226 100644
--- a/packages/wolf_3d_dart/test/rasterizer/pushwall_rasterizer_test.dart
+++ b/packages/wolf_3d_dart/test/rasterizer/pushwall_rasterizer_test.dart
@@ -45,7 +45,7 @@ void main() {
                   wallGrid: wallGrid,
                   areaGrid: List.generate(64, (_) => List.filled(64, -1)),
                   objectGrid: objectGrid,
-                  musicIndex: 0,
+                  music: Music.level01,
                 ),
               ],
             ),
diff --git a/packages/wolf_3d_dart/test/rendering/pushwall_renderer_test.dart b/packages/wolf_3d_dart/test/rendering/pushwall_renderer_test.dart
index cb96998..cf2d08e 100644
--- a/packages/wolf_3d_dart/test/rendering/pushwall_renderer_test.dart
+++ b/packages/wolf_3d_dart/test/rendering/pushwall_renderer_test.dart
@@ -45,7 +45,7 @@ void main() {
                   wallGrid: wallGrid,
                   areaGrid: List.generate(64, (_) => List.filled(64, -1)),
                   objectGrid: objectGrid,
-                  musicIndex: 0,
+                  music: Music.level01,
                 ),
               ],
             ),
diff --git a/packages/wolf_3d_flutter/lib/audio/audio_adaptor.dart b/packages/wolf_3d_flutter/lib/audio/audio_adaptor.dart
index 3c3b49a..9f3db2b 100644
--- a/packages/wolf_3d_flutter/lib/audio/audio_adaptor.dart
+++ b/packages/wolf_3d_flutter/lib/audio/audio_adaptor.dart
@@ -8,8 +8,8 @@ class FlutterAudioAdapter implements EngineAudio {
   FlutterAudioAdapter(this.wolf3d);
 
   @override
-  void playLevelMusic(WolfLevel level) {
-    wolf3d.audio.playLevelMusic(level);
+  void playLevelMusic(Music music) {
+    wolf3d.audio.playLevelMusic(music);
   }
 
   @override
@@ -23,8 +23,13 @@ class FlutterAudioAdapter implements EngineAudio {
   }
 
   @override
-  void playSoundEffect(int sfxId) {
-    wolf3d.audio.playSoundEffect(sfxId);
+  void playSoundEffect(SoundEffect effect) {
+    wolf3d.audio.playSoundEffect(effect);
+  }
+
+  @override
+  void playSoundEffectId(int sfxId) {
+    wolf3d.audio.playSoundEffectId(sfxId);
   }
 
   @override