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packages/feature_common/lib/widgets/ad_banner_widget.dart

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+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:google_mobile_ads/google_mobile_ads.dart';
+
+class AdBannerWidget extends StatefulWidget {
+  const AdBannerWidget({super.key});
+
+  @override
+  State<AdBannerWidget> createState() => _AdBannerWidgetState();
+}
+
+class _AdBannerWidgetState extends State<AdBannerWidget> {
+  BannerAd? _bannerAd;
+  bool _isAdLoaded = false;
+
+  // TODO: 릴리스 시 실제 Ad Unit ID로 교체하세요.
+  final String _androidAdUnitId = 'ca-app-pub-3940256099942544/6300978111'; // 테스트 ID
+  final String _iosAdUnitId = 'ca-app-pub-3940256099942544/2934735716'; // 테스트 ID
+
+  @override
+  void initState() {
+    super.initState();
+    _loadAd();
+  }
+
+  void _loadAd() {
+    _bannerAd = BannerAd(
+      adUnitId: Platform.isAndroid ? _androidAdUnitId : _iosAdUnitId,
+      size: AdSize.banner,
+      request: const AdRequest(),
+      listener: BannerAdListener(
+        onAdLoaded: (Ad ad) {
+          setState(() {
+            _isAdLoaded = true;
+          });
+        },
+        onAdFailedToLoad: (Ad ad, LoadAdError error) {
+          print('Ad failed to load: $error');
+          ad.dispose();
+        },
+      ),
+    )..load();
+  }
+
+  @override
+  void dispose() {
+    _bannerAd?.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_isAdLoaded && _bannerAd != null) {
+      // 광고가 로드되면 광고 위젯을 표시
+      return Container(
+        width: _bannerAd!.size.width.toDouble(),
+        height: _bannerAd!.size.height.toDouble(),
+        alignment: Alignment.center,
+        child: AdWidget(ad: _bannerAd!),
+      );
+    } else {
+      // 로드되지 않았으면, 광고 높이만큼의 빈 공간만 차지
+      return Container(
+        height: AdSize.banner.height.toDouble(),
+      );
+    }
+  }
+}

packages/feature_common/lib/widgets/common_game_shell.dart

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+// packages/feature_common/lib/widgets/common_game_shell.dart
+import 'package:flutter/material.dart';
+import '../screens/ranking_screen.dart';
+import '../screens/settings_screen.dart';
+import 'ad_banner_widget.dart';
+
+/// 모든 게임 앱이 공유하는 '공통 셸' 위젯
+/// (AppBar, 설정/랭킹 버튼, 하단 광고 배너 포함)
+class CommonGameShell extends StatelessWidget {
+  final Widget body;
+  final String title;
+
+  /// 랭킹 버튼을 눌렀을 때 실행될 함수 (외부 주입)
+  /// null을 전달하면 랭킹 버튼이 비활성화됩니다.
+  final VoidCallback? onRankingPressed;
+
+  const CommonGameShell({
+    super.key,
+    required this.body,
+    required this.title,
+    this.onRankingPressed,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(title),
+        actions: [
+          // 랭킹 버튼
+          IconButton(
+            icon: const Icon(Icons.leaderboard_outlined),
+            onPressed: onRankingPressed, // 👈 주입받은 함수 실행
+          ),
+          // 설정 버튼
+          IconButton(
+            icon: const Icon(Icons.settings_outlined),
+            onPressed: () {
+              Navigator.push(
+                context,
+                MaterialPageRoute(
+                  builder: (context) => const SettingsScreen(),
+                ),
+              );
+            },
+          ),
+        ],
+      ),
+      body: body, // 👈 주입받은 내용물
+      bottomNavigationBar: const AdBannerWidget(),
+    );
+  }
+}