diff --git a/lib/src/app.dart b/lib/src/app.dart
index fd51c6a..d902bdd 100644
--- a/lib/src/app.dart
+++ b/lib/src/app.dart
@@ -3,7 +3,9 @@ import 'package:flutter/material.dart';
 import 'package:asciineverdie/data/game_text_l10n.dart' as game_l10n;
 import 'package:asciineverdie/l10n/app_localizations.dart';
 import 'package:asciineverdie/src/core/audio/audio_service.dart';
+import 'package:asciineverdie/src/core/engine/ad_service.dart';
 import 'package:asciineverdie/src/core/engine/debug_settings_service.dart';
+import 'package:asciineverdie/src/core/engine/iap_service.dart';
 import 'package:asciineverdie/src/shared/retro_colors.dart';
 import 'package:asciineverdie/src/core/engine/game_mutations.dart';
 import 'package:asciineverdie/src/core/engine/progress_service.dart';
@@ -46,7 +48,8 @@ class SavedGamePreview {
   final String actName;
 }
 
-class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
+class _AskiiNeverDieAppState extends State<AskiiNeverDieApp>
+    with WidgetsBindingObserver {
   late final GameSessionController _controller;
   late final NotificationService _notificationService;
   late final SettingsRepository _settingsRepository;
@@ -57,12 +60,15 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
   bool _isCheckingSave = true;
   bool _hasSave = false;
   SavedGamePreview? _savedGamePreview;
-  ThemeMode _themeMode = ThemeMode.system;
   HallOfFame _hallOfFame = HallOfFame.empty();
+  Locale? _locale; // 사용자 선택 로케일 (null이면 시스템 기본값)
+  bool _isAdRemovalPurchased = false;
+  String? _removeAdsPrice;
 
   @override
   void initState() {
     super.initState();
+    WidgetsBinding.instance.addObserver(this);
     const config = PqConfig();
     final mutations = GameMutations(config);
     final rewards = RewardService(mutations, config);
@@ -83,14 +89,33 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
     // 초기 설정 및 오디오 서비스 로드
     _loadSettings();
     _audioService.init();
-    // 디버그 설정 서비스 초기화 (Phase 8)
-    DebugSettingsService.instance.initialize();
+    // IAP 서비스 초기화
+    _initIAP();
     // 세이브 파일 존재 여부 확인
     _checkForExistingSave();
     // 명예의 전당 로드
     _loadHallOfFame();
   }
 
+  /// IAP 및 광고 서비스 초기화
+  Future<void> _initIAP() async {
+    await IAPService.instance.initialize();
+    await AdService.instance.initialize();
+    _updateIAPState();
+  }
+
+  /// IAP 상태 업데이트 (구매 여부, 가격)
+  void _updateIAPState() {
+    if (mounted) {
+      setState(() {
+        _isAdRemovalPurchased = IAPService.instance.isAdRemovalPurchased;
+        _removeAdsPrice = IAPService.instance.isStoreAvailable
+            ? IAPService.instance.removeAdsPrice
+            : null;
+      });
+    }
+  }
+
   /// 명예의 전당 로드
   Future<void> _loadHallOfFame() async {
     final hallOfFame = await _hallOfFameStorage.load();
@@ -103,16 +128,26 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
 
   /// 저장된 설정 불러오기
   Future<void> _loadSettings() async {
-    final themeMode = await _settingsRepository.loadThemeMode();
+    // 디버그 설정 먼저 초기화 (광고/IAP 시뮬레이션 설정 동기화)
+    await DebugSettingsService.instance.initialize();
+
+    final localeCode = await _settingsRepository.loadLocale();
     if (mounted) {
-      setState(() => _themeMode = themeMode);
+      setState(() {
+        // 저장된 로케일이 있으면 적용
+        if (localeCode != null) {
+          _locale = Locale(localeCode);
+          game_l10n.setGameLocale(localeCode);
+        }
+      });
     }
   }
 
-  /// 테마 모드 변경
-  void _changeThemeMode(ThemeMode mode) {
-    setState(() => _themeMode = mode);
-    _settingsRepository.saveThemeMode(mode);
+  /// 로케일 변경
+  void _changeLocale(String localeCode) {
+    setState(() {
+      _locale = Locale(localeCode);
+    });
   }
 
   /// 세이브 파일 존재 여부 확인 및 미리보기 정보 로드
@@ -139,8 +174,11 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
         _savedGamePreview = preview;
         _isCheckingSave = false;
       });
-      // 세이브 확인 완료 후 타이틀 BGM 재생
-      _audioService.playBgm('title');
+      // 세이브 확인 완료 후 타이틀 BGM 재생 (앱이 포그라운드일 때만)
+      final lifecycleState = WidgetsBinding.instance.lifecycleState;
+      if (lifecycleState == AppLifecycleState.resumed) {
+        _audioService.playBgm('title');
+      }
     }
   }
 
@@ -159,148 +197,32 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
 
   @override
   void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
     _controller.dispose();
     _notificationService.dispose();
     _audioService.dispose();
     super.dispose();
   }
 
-  /// 라이트 테마 (Classic Parchment 스타일)
-  ThemeData get _lightTheme => ThemeData(
-    colorScheme: RetroColors.lightColorScheme,
-    scaffoldBackgroundColor: const Color(0xFFFAF4ED),
-    useMaterial3: true,
-    // 카드/다이얼로그 레트로 배경
-    cardColor: const Color(0xFFF2E8DC),
-    dialogTheme: const DialogThemeData(
-      backgroundColor: Color(0xFFF2E8DC),
-      titleTextStyle: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 15,
-        color: Color(0xFFB8860B),
-      ),
-    ),
-    // 앱바 레트로 스타일
-    appBarTheme: const AppBarTheme(
-      backgroundColor: Color(0xFFF2E8DC),
-      foregroundColor: Color(0xFF1F1F28),
-      titleTextStyle: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 15,
-        color: Color(0xFFB8860B),
-      ),
-    ),
-    // 버튼 테마
-    filledButtonTheme: FilledButtonThemeData(
-      style: FilledButton.styleFrom(
-        backgroundColor: const Color(0xFFE8DDD0),
-        foregroundColor: const Color(0xFF1F1F28),
-        textStyle: const TextStyle(
-          inherit: false,
-          fontFamily: 'PressStart2P',
-          fontSize: 14,
-          color: Color(0xFF1F1F28),
-        ),
-      ),
-    ),
-    outlinedButtonTheme: OutlinedButtonThemeData(
-      style: OutlinedButton.styleFrom(
-        foregroundColor: const Color(0xFFB8860B),
-        side: const BorderSide(color: Color(0xFFB8860B), width: 2),
-        textStyle: const TextStyle(
-          inherit: false,
-          fontFamily: 'PressStart2P',
-          fontSize: 14,
-          color: Color(0xFFB8860B),
-        ),
-      ),
-    ),
-    textButtonTheme: TextButtonThemeData(
-      style: TextButton.styleFrom(
-        foregroundColor: const Color(0xFF4A4458),
-        textStyle: const TextStyle(
-          inherit: false,
-          fontFamily: 'PressStart2P',
-          fontSize: 14,
-          color: Color(0xFF4A4458),
-        ),
-      ),
-    ),
-    // 텍스트 테마
-    textTheme: const TextTheme(
-      headlineLarge: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 20,
-        color: Color(0xFFB8860B),
-      ),
-      headlineMedium: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 16,
-        color: Color(0xFFB8860B),
-      ),
-      headlineSmall: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 15,
-        color: Color(0xFFB8860B),
-      ),
-      titleLarge: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 15,
-        color: Color(0xFF1F1F28),
-      ),
-      titleMedium: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 14,
-        color: Color(0xFF1F1F28),
-      ),
-      titleSmall: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 14,
-        color: Color(0xFF1F1F28),
-      ),
-      bodyLarge: TextStyle(fontSize: 18, color: Color(0xFF1F1F28)),
-      bodyMedium: TextStyle(fontSize: 17, color: Color(0xFF1F1F28)),
-      bodySmall: TextStyle(fontSize: 15, color: Color(0xFF1F1F28)),
-      labelLarge: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 14,
-        color: Color(0xFF1F1F28),
-      ),
-      labelMedium: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 14,
-        color: Color(0xFF1F1F28),
-      ),
-      labelSmall: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 13,
-        color: Color(0xFF1F1F28),
-      ),
-    ),
-    // 칩 테마
-    chipTheme: const ChipThemeData(
-      backgroundColor: Color(0xFFE8DDD0),
-      labelStyle: TextStyle(
-        fontFamily: 'PressStart2P',
-        fontSize: 14,
-        color: Color(0xFF1F1F28),
-      ),
-      side: BorderSide(color: Color(0xFF8B7355)),
-    ),
-    // 리스트 타일 테마
-    listTileTheme: const ListTileThemeData(
-      textColor: Color(0xFF1F1F28),
-      iconColor: Color(0xFFB8860B),
-    ),
-    // 프로그레스 인디케이터
-    progressIndicatorTheme: const ProgressIndicatorThemeData(
-      color: Color(0xFFB8860B),
-      linearTrackColor: Color(0xFFD4C4B0),
-    ),
-  );
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    super.didChangeAppLifecycleState(state);
+    // 앱이 백그라운드로 내려가면 오디오 정지
+    if (state == AppLifecycleState.paused ||
+        state == AppLifecycleState.inactive) {
+      _audioService.pauseAll();
+    } else if (state == AppLifecycleState.resumed) {
+      _audioService.resumeAll().then((_) {
+        // 복귀 후 BGM이 없고 시작 화면이면 타이틀 BGM 재생
+        if (_audioService.currentBgm == null && !_isCheckingSave) {
+          _audioService.playBgm('title');
+        }
+      });
+    }
+  }
 
-  /// 다크 테마 (Dark Fantasy 스타일)
-  ThemeData get _darkTheme => ThemeData(
+  /// 앱 테마 (Dark Fantasy 스타일)
+  ThemeData get _theme => ThemeData(
     colorScheme: RetroColors.darkColorScheme,
     scaffoldBackgroundColor: RetroColors.deepBrown,
     useMaterial3: true,
@@ -440,9 +362,8 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
       debugShowCheckedModeBanner: false,
       localizationsDelegates: L10n.localizationsDelegates,
       supportedLocales: L10n.supportedLocales,
-      theme: _lightTheme,
-      darkTheme: _darkTheme,
-      themeMode: _themeMode,
+      locale: _locale, // 사용자 선택 로케일 (null이면 시스템 기본값)
+      theme: _theme,
       navigatorObservers: [_routeObserver],
       builder: (context, child) {
         // 현재 로케일을 게임 텍스트 l10n 시스템에 동기화
@@ -470,13 +391,18 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
       onHallOfFame: _navigateToHallOfFame,
       onLocalArena: _navigateToArena,
       onSettings: _showSettings,
+      onPurchaseRemoveAds: _purchaseRemoveAds,
+      onRestorePurchase: _restorePurchase,
       hasSaveFile: _hasSave,
       savedGamePreview: _savedGamePreview,
       hallOfFameCount: _hallOfFame.count,
+      isAdRemovalPurchased: _isAdRemovalPurchased,
+      removeAdsPrice: _removeAdsPrice,
       routeObserver: _routeObserver,
       onRefresh: () {
         _checkForExistingSave();
         _loadHallOfFame();
+        _updateIAPState();
       },
     );
   }
@@ -551,8 +477,6 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
             controller: _controller,
             audioService: _audioService,
             forceCarouselLayout: testMode,
-            currentThemeMode: _themeMode,
-            onThemeModeChange: _changeThemeMode,
           ),
         ),
       );
@@ -568,8 +492,6 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
               audioService: _audioService,
               // 디버그 모드로 저장된 게임 로드 시 캐로셀 레이아웃 강제
               forceCarouselLayout: _controller.cheatsEnabled,
-              currentThemeMode: _themeMode,
-              onThemeModeChange: _changeThemeMode,
             ),
           ),
         )
@@ -613,12 +535,60 @@ class _AskiiNeverDieAppState extends State<AskiiNeverDieApp> {
     SettingsScreen.show(
       context,
       settingsRepository: _settingsRepository,
-      currentThemeMode: _themeMode,
-      onThemeModeChange: _changeThemeMode,
+      onLocaleChange: _changeLocale,
       onBgmVolumeChange: _audioService.setBgmVolume,
       onSfxVolumeChange: _audioService.setSfxVolume,
     );
   }
+
+  /// 광고 제거 구매
+  Future<void> _purchaseRemoveAds(BuildContext context) async {
+    final result = await IAPService.instance.purchaseRemoveAds();
+    _updateIAPState();
+
+    if (!context.mounted) return;
+
+    switch (result) {
+      case IAPResult.success:
+      case IAPResult.debugSimulated:
+        _notificationService.showInfo(game_l10n.iapPurchaseSuccess);
+      case IAPResult.alreadyPurchased:
+        _notificationService.showInfo(game_l10n.iapAlreadyPurchased);
+      case IAPResult.cancelled:
+        // 취소는 무시
+        break;
+      case IAPResult.storeUnavailable:
+        _notificationService.showWarning(game_l10n.iapStoreUnavailable);
+      case IAPResult.productNotFound:
+      case IAPResult.failed:
+        _notificationService.showWarning(game_l10n.iapPurchaseFailed);
+    }
+  }
+
+  /// 구매 복원
+  Future<void> _restorePurchase(BuildContext context) async {
+    final result = await IAPService.instance.restorePurchases();
+    _updateIAPState();
+
+    if (!context.mounted) return;
+
+    switch (result) {
+      case IAPResult.success:
+      case IAPResult.debugSimulated:
+        if (_isAdRemovalPurchased) {
+          _notificationService.showInfo(game_l10n.iapRestoreSuccess);
+        } else {
+          _notificationService.showInfo(game_l10n.iapRestoreFailed);
+        }
+      case IAPResult.storeUnavailable:
+        _notificationService.showWarning(game_l10n.iapStoreUnavailable);
+      case IAPResult.alreadyPurchased:
+      case IAPResult.cancelled:
+      case IAPResult.productNotFound:
+      case IAPResult.failed:
+        _notificationService.showWarning(game_l10n.iapRestoreFailed);
+    }
+  }
 }
 
 /// 스플래시 화면 (세이브 파일 확인 중) - 레트로 스타일
diff --git a/lib/src/shared/widgets/retro_panel.dart b/lib/src/shared/widgets/retro_panel.dart
index 48c523f..80c61e3 100644
--- a/lib/src/shared/widgets/retro_panel.dart
+++ b/lib/src/shared/widgets/retro_panel.dart
@@ -14,7 +14,11 @@ class RetroPanel extends StatelessWidget {
     this.borderWidth = 3.0,
     this.useGoldBorder = false,
     this.title,
-  });
+    this.titleWidget,
+  }) : assert(
+         title == null || titleWidget == null,
+         'title과 titleWidget 중 하나만 사용 가능',
+       );
 
   /// 패널 내부 컨텐츠
   final Widget child;
@@ -34,6 +38,9 @@ class RetroPanel extends StatelessWidget {
   /// 패널 타이틀 (상단에 표시)
   final String? title;
 
+  /// 커스텀 타이틀 위젯 (title 대신 사용)
+  final Widget? titleWidget;
+
   @override
   Widget build(BuildContext context) {
     final painter = useGoldBorder
@@ -46,16 +53,24 @@ class RetroPanel extends StatelessWidget {
             fillColor: backgroundColor,
           );
 
+    final hasTitle = title != null || titleWidget != null;
+
     return CustomPaint(
       painter: painter,
       child: Padding(
         padding: EdgeInsets.all(borderWidth).add(padding),
-        child: title != null
+        child: hasTitle
             ? Column(
                 crossAxisAlignment: CrossAxisAlignment.stretch,
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                  _PanelTitle(title: title!, useGoldBorder: useGoldBorder),
+                  if (titleWidget != null)
+                    _PanelTitleContainer(
+                      useGoldBorder: useGoldBorder,
+                      child: titleWidget!,
+                    )
+                  else
+                    _PanelTitle(title: title!, useGoldBorder: useGoldBorder),
                   const SizedBox(height: 8),
                   Flexible(child: child),
                 ],
@@ -73,6 +88,33 @@ class _PanelTitle extends StatelessWidget {
   final String title;
   final bool useGoldBorder;
 
+  @override
+  Widget build(BuildContext context) {
+    return _PanelTitleContainer(
+      useGoldBorder: useGoldBorder,
+      child: Text(
+        title.toUpperCase(),
+        style: TextStyle(
+          fontFamily: 'PressStart2P',
+          fontSize: 14,
+          color: useGoldBorder ? RetroColors.gold : RetroColors.textLight,
+          letterSpacing: 1,
+        ),
+      ),
+    );
+  }
+}
+
+/// 패널 타이틀 컨테이너 (커스텀 위젯용)
+class _PanelTitleContainer extends StatelessWidget {
+  const _PanelTitleContainer({
+    required this.useGoldBorder,
+    required this.child,
+  });
+
+  final bool useGoldBorder;
+  final Widget child;
+
   @override
   Widget build(BuildContext context) {
     return Container(
@@ -90,15 +132,7 @@ class _PanelTitle extends StatelessWidget {
           ),
         ),
       ),
-      child: Text(
-        title.toUpperCase(),
-        style: TextStyle(
-          fontFamily: 'PressStart2P',
-          fontSize: 14,
-          color: useGoldBorder ? RetroColors.gold : RetroColors.textLight,
-          letterSpacing: 1,
-        ),
-      ),
+      child: child,
     );
   }
 }
@@ -110,11 +144,16 @@ class RetroGoldPanel extends StatelessWidget {
     required this.child,
     this.padding = const EdgeInsets.all(12),
     this.title,
-  });
+    this.titleWidget,
+  }) : assert(
+         title == null || titleWidget == null,
+         'title과 titleWidget 중 하나만 사용 가능',
+       );
 
   final Widget child;
   final EdgeInsets padding;
   final String? title;
+  final Widget? titleWidget;
 
   @override
   Widget build(BuildContext context) {
@@ -122,6 +161,7 @@ class RetroGoldPanel extends StatelessWidget {
       useGoldBorder: true,
       padding: padding,
       title: title,
+      titleWidget: titleWidget,
       child: child,
     );
   }