diff --git a/lib/game/config/app_strings.dart b/lib/game/config/app_strings.dart
new file mode 100644
index 0000000..90cedd9
--- /dev/null
+++ b/lib/game/config/app_strings.dart
@@ -0,0 +1,64 @@
+class AppStrings {
+  // Main Menu
+  static const String gameTitle = "Colosseum's Choice";
+  static const String startGame = "Start Game";
+  static const String continueGame = "Continue";
+  static const String exitGame = "Exit Game";
+  static const String credits = "Credits";
+
+  // Common Actions
+  static const String confirm = "Confirm";
+  static const String cancel = "Cancel";
+  static const String back = "Back";
+  static const String close = "Close";
+  static const String equip = "Equip";
+  static const String unequip = "Unequip";
+  static const String discard = "Discard";
+  static const String sell = "Sell";
+  static const String buy = "Buy";
+
+  // Stats
+  static const String hp = "HP";
+  static const String atk = "ATK";
+  static const String def = "DEF";
+  static const String armor = "Armor";
+  static const String luck = "Luck";
+  static const String gold = "Gold";
+
+  // Battle
+  static const String attack = "Attack";
+  static const String defend = "Defend";
+  static const String turn = "Turn";
+  static const String playerTurn = "Player's Turn";
+  static const String enemyTurn = "Enemy's Turn";
+  static const String victory = "Victory!";
+  static const String defeat = "Defeat";
+  static const String reward = "Reward";
+  static const String chooseReward = "Choose a Reward";
+  static const String skip = "Skip";
+  static const String nextStage = "Next Stage";
+  static const String returnToMenu = "Return to Menu";
+  static const String restart = "Restart";
+
+  // Inventory
+  static const String inventory = "Inventory";
+  static const String equipment = "Equipment";
+  static const String bag = "Bag";
+  static const String emptySlot = "Empty";
+  static const String noItems = "No items in inventory";
+
+  // Shop
+  static const String shopTitle = "Merchant";
+  static const String shopWelcome = "Welcome, traveler!";
+  static const String refreshShop = "Restock";
+  static const String notEnoughGold = "Not enough gold!";
+  static const String inventoryFull = "Inventory is full!";
+
+  // Risk Levels
+  static const String riskSafe = "Safe";
+  static const String riskNormal = "Normal";
+  static const String riskRisky = "Risky";
+  
+  // Settings
+  static const String settings = "Settings";
+}
diff --git a/lib/screens/battle_screen.dart b/lib/screens/battle_screen.dart
index 7ed57ae..c0c1cc3 100644
--- a/lib/screens/battle_screen.dart
+++ b/lib/screens/battle_screen.dart
@@ -21,6 +21,7 @@ import '../widgets/battle/explosion_widget.dart';
 import 'main_menu_screen.dart';
 import '../game/config/battle_config.dart';
 import '../game/config/theme_config.dart';
+import '../game/config/app_strings.dart';
 
 class BattleScreen extends StatefulWidget {
   const BattleScreen({super.key});
@@ -43,7 +44,7 @@ class _BattleScreenState extends State<BattleScreen> {
       GlobalKey<BattleAnimationWidgetState>();
   final GlobalKey<ExplosionWidgetState> _explosionKey =
       GlobalKey<ExplosionWidgetState>();
-  bool _showLogs = true;
+  bool _showLogs = false;
   bool _isPlayerAttacking = false; // Player Attack Animation State
 
   @override
@@ -421,7 +422,7 @@ class _BattleScreenState extends State<BattleScreen> {
                             child: FittedBox(
                               fit: BoxFit.scaleDown,
                               child: Text(
-                                "Turn ${battleProvider.turnCount}",
+                                "${AppStrings.turn} ${battleProvider.turnCount}",
                                 style: const TextStyle(
                                   color: ThemeConfig.textColorWhite,
                                   fontSize: ThemeConfig.fontSizeHeader,
@@ -540,12 +541,16 @@ class _BattleScreenState extends State<BattleScreen> {
                       child: SimpleDialog(
                         title: Row(
                           children: [
-                            const Text("Victory! Choose a Reward"),
+                            const Text("${AppStrings.victory} ${AppStrings.chooseReward}"),
                             const Spacer(),
                             Row(
                               mainAxisSize: MainAxisSize.min,
                               children: [
-                                Icon(Icons.monetization_on, color: ThemeConfig.statGoldColor, size: 18),
+                                Icon(
+                                  Icons.monetization_on,
+                                  color: ThemeConfig.statGoldColor,
+                                  size: 18,
+                                ),
                                 const SizedBox(width: 4),
                                 Text(
                                   "${battleProvider.lastGoldReward} G",
@@ -568,7 +573,7 @@ class _BattleScreenState extends State<BattleScreen> {
                                 ScaffoldMessenger.of(context).showSnackBar(
                                   const SnackBar(
                                     content: Text(
-                                      "Inventory is full! Cannot take item.",
+                                      "${AppStrings.inventoryFull} Cannot take item.",
                                     ),
                                     backgroundColor: Colors.red,
                                   ),
@@ -586,10 +591,11 @@ class _BattleScreenState extends State<BattleScreen> {
                                         decoration: BoxDecoration(
                                           color: Colors.blueGrey[700],
                                           borderRadius: BorderRadius.circular(
-                                              4),
+                                            4,
+                                          ),
                                           border: Border.all(
-                                            color: item.rarity !=
-                                                    ItemRarity.magic
+                                            color:
+                                                item.rarity != ItemRarity.magic
                                                 ? ItemUtils.getRarityColor(
                                                     item.rarity,
                                                   )
@@ -613,7 +619,8 @@ class _BattleScreenState extends State<BattleScreen> {
                                         color: isSkip
                                             ? ThemeConfig.textColorGrey
                                             : ItemUtils.getRarityColor(
-                                                item.rarity),
+                                                item.rarity,
+                                              ),
                                       ),
                                     ),
                                   ],
@@ -651,7 +658,7 @@ class _BattleScreenState extends State<BattleScreen> {
                         mainAxisSize: MainAxisSize.min,
                         children: [
                           const Text(
-                            "DEFEAT",
+                            AppStrings.defeat,
                             style: TextStyle(
                               color: ThemeConfig.statHpColor,
                               fontSize: ThemeConfig.fontSizeHuge,
@@ -677,7 +684,7 @@ class _BattleScreenState extends State<BattleScreen> {
                               );
                             },
                             child: const Text(
-                              "Return to Main Menu",
+                              AppStrings.returnToMenu,
                               style: TextStyle(
                                 color: ThemeConfig.textColorWhite,
                                 fontSize: ThemeConfig.fontSizeHeader,
@@ -698,10 +705,10 @@ class _BattleScreenState extends State<BattleScreen> {
 
   Widget _buildItemStatText(Item item) {
     List<String> stats = [];
-    if (item.atkBonus > 0) stats.add("+${item.atkBonus} ATK");
-    if (item.hpBonus > 0) stats.add("+${item.hpBonus} HP");
-    if (item.armorBonus > 0) stats.add("+${item.armorBonus} DEF");
-    if (item.luck > 0) stats.add("+${item.luck} Luck");
+    if (item.atkBonus > 0) stats.add("+${item.atkBonus} ${AppStrings.atk}");
+    if (item.hpBonus > 0) stats.add("+${item.hpBonus} ${AppStrings.hp}");
+    if (item.armorBonus > 0) stats.add("+${item.armorBonus} ${AppStrings.def}");
+    if (item.luck > 0) stats.add("+${item.luck} ${AppStrings.luck}");
 
     List<String> effectTexts = item.effects.map((e) => e.description).toList();
 
@@ -715,7 +722,10 @@ class _BattleScreenState extends State<BattleScreen> {
             padding: const EdgeInsets.only(top: 4.0, bottom: 4.0),
             child: Text(
               stats.join(", "),
-              style: const TextStyle(fontSize: ThemeConfig.fontSizeMedium, color: ThemeConfig.statAtkColor),
+              style: const TextStyle(
+                fontSize: ThemeConfig.fontSizeMedium,
+                color: ThemeConfig.statAtkColor,
+              ),
             ),
           ),
         if (effectTexts.isNotEmpty)
@@ -723,7 +733,10 @@ class _BattleScreenState extends State<BattleScreen> {
             padding: const EdgeInsets.only(bottom: 4.0),
             child: Text(
               effectTexts.join(", "),
-              style: const TextStyle(fontSize: 11, color: ThemeConfig.rarityLegendary), // 11 is custom, keep or change? Let's use Small
+              style: const TextStyle(
+                fontSize: 11,
+                color: ThemeConfig.rarityLegendary,
+              ), // 11 is custom, keep or change? Let's use Small
             ),
           ),
       ],
diff --git a/lib/screens/character_selection_screen.dart b/lib/screens/character_selection_screen.dart
index 2caeb4f..6bec011 100644
--- a/lib/screens/character_selection_screen.dart
+++ b/lib/screens/character_selection_screen.dart
@@ -5,6 +5,7 @@ import '../game/data/player_table.dart';
 import 'main_wrapper.dart';
 import '../widgets/responsive_container.dart';
 import '../game/config/theme_config.dart';
+import '../game/config/app_strings.dart';
 
 class CharacterSelectionScreen extends StatelessWidget {
   const CharacterSelectionScreen({super.key});
@@ -83,19 +84,19 @@ class CharacterSelectionScreen extends StatelessWidget {
                             mainAxisAlignment: MainAxisAlignment.spaceAround,
                             children: [
                               Text(
-                                "HP: ${warrior.baseHp}",
+                                "${AppStrings.hp}: ${warrior.baseHp}",
                                 style: const TextStyle(
                                   fontWeight: ThemeConfig.fontWeightBold,
                                 ),
                               ),
                               Text(
-                                "ATK: ${warrior.baseAtk}",
+                                "${AppStrings.atk}: ${warrior.baseAtk}",
                                 style: const TextStyle(
                                   fontWeight: ThemeConfig.fontWeightBold,
                                 ),
                               ),
                               Text(
-                                "DEF: ${warrior.baseDefense}",
+                                "${AppStrings.def}: ${warrior.baseDefense}",
                                 style: const TextStyle(
                                   fontWeight: ThemeConfig.fontWeightBold,
                                 ),
diff --git a/lib/screens/inventory_screen.dart b/lib/screens/inventory_screen.dart
index 47c522d..ef09d65 100644
--- a/lib/screens/inventory_screen.dart
+++ b/lib/screens/inventory_screen.dart
@@ -5,6 +5,7 @@ import '../game/model/item.dart';
 import '../game/enums.dart';
 import '../utils/item_utils.dart';
 import '../game/config/theme_config.dart';
+import '../game/config/app_strings.dart';
 
 class InventoryScreen extends StatelessWidget {
   const InventoryScreen({super.key});
@@ -37,28 +38,28 @@ class InventoryScreen extends StatelessWidget {
                         mainAxisAlignment: MainAxisAlignment.spaceAround,
                         children: [
                           _buildStatItem(
-                            "HP",
+                            AppStrings.hp,
                             "${player.hp}/${player.totalMaxHp}",
                             color: ThemeConfig.statHpColor,
                           ),
                           _buildStatItem(
-                            "ATK",
+                            AppStrings.atk,
                             "${player.totalAtk}",
                             color: ThemeConfig.statAtkColor,
                           ),
                           _buildStatItem(
-                            "DEF",
+                            AppStrings.def,
                             "${player.totalDefense}",
                             color: ThemeConfig.statDefColor,
                           ),
-                          _buildStatItem("Shield", "${player.armor}"),
+                          _buildStatItem(AppStrings.armor, "${player.armor}"),
                           _buildStatItem(
-                            "Luck",
+                            AppStrings.luck,
                             "${player.totalLuck}",
                             color: ThemeConfig.statLuckColor,
                           ),
                           _buildStatItem(
-                            "Gold",
+                            AppStrings.gold,
                             "${player.gold} G",
                             color: ThemeConfig.statGoldColor,
                           ),
@@ -162,7 +163,7 @@ class InventoryScreen extends StatelessWidget {
                                           FittedBox(
                                             fit: BoxFit.scaleDown,
                                             child: Text(
-                                              item?.name ?? "Empty",
+                                              item?.name ?? AppStrings.emptySlot,
                                               textAlign: TextAlign.center,
                                               style: TextStyle(
                                                 fontSize:
@@ -208,7 +209,7 @@ class InventoryScreen extends StatelessWidget {
                 child: Align(
                   alignment: Alignment.centerLeft,
                   child: Text(
-                    "Bag (${player.inventory.length}/${player.maxInventorySize})",
+                    "${AppStrings.bag} (${player.inventory.length}/${player.maxInventorySize})",
                     style: const TextStyle(
                       fontSize: ThemeConfig.fontSizeHeader,
                       fontWeight: ThemeConfig.fontWeightBold,
@@ -371,7 +372,7 @@ class InventoryScreen extends StatelessWidget {
                 children: [
                   Icon(Icons.shield, color: ThemeConfig.btnDefendActive),
                   SizedBox(width: 10),
-                  Text("Equip"),
+                  Text(AppStrings.equip),
                 ],
               ),
             ),
@@ -391,7 +392,7 @@ class InventoryScreen extends StatelessWidget {
                       color: ThemeConfig.statGoldColor,
                     ),
                     const SizedBox(width: 10),
-                    Text("Sell (${item.price} G)"),
+                    Text("${AppStrings.sell} (${item.price} G)"),
                   ],
                 ),
               ),
@@ -407,7 +408,7 @@ class InventoryScreen extends StatelessWidget {
                 children: [
                   Icon(Icons.delete, color: ThemeConfig.btnActionActive),
                   SizedBox(width: 10),
-                  Text("Discard"),
+                  Text(AppStrings.discard),
                 ],
               ),
             ),
@@ -430,7 +431,7 @@ class InventoryScreen extends StatelessWidget {
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(ctx),
-            child: const Text("Cancel"),
+            child: const Text(AppStrings.cancel),
           ),
           ElevatedButton(
             style: ElevatedButton.styleFrom(
@@ -440,7 +441,7 @@ class InventoryScreen extends StatelessWidget {
               provider.sellItem(item);
               Navigator.pop(ctx);
             },
-            child: const Text("Sell", style: TextStyle(color: Colors.black)),
+            child: const Text(AppStrings.sell, style: TextStyle(color: Colors.black)),
           ),
         ],
       ),
@@ -460,7 +461,7 @@ class InventoryScreen extends StatelessWidget {
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(ctx),
-            child: const Text("Cancel"),
+            child: const Text(AppStrings.cancel),
           ),
           ElevatedButton(
             style: ElevatedButton.styleFrom(
@@ -470,7 +471,7 @@ class InventoryScreen extends StatelessWidget {
               provider.discardItem(item);
               Navigator.pop(ctx);
             },
-            child: const Text("Discard"),
+            child: const Text(AppStrings.discard),
           ),
         ],
       ),
@@ -510,7 +511,7 @@ class InventoryScreen extends StatelessWidget {
           mainAxisSize: MainAxisSize.min,
           children: [
             Text(
-              "Equip ${newItem.name}?",
+              "${AppStrings.equip} ${newItem.name}?",
               style: const TextStyle(fontWeight: ThemeConfig.fontWeightBold),
             ),
             if (oldItem != null)
@@ -524,8 +525,8 @@ class InventoryScreen extends StatelessWidget {
             const SizedBox(height: 16),
             _buildStatChangeRow("Max HP", currentMaxHp, newMaxHp),
             _buildStatChangeRow("Current HP", currentHp, newHp),
-            _buildStatChangeRow("ATK", currentAtk, newAtk),
-            _buildStatChangeRow("DEF", currentDef, newDef),
+            _buildStatChangeRow(AppStrings.atk, currentAtk, newAtk),
+            _buildStatChangeRow(AppStrings.def, currentDef, newDef),
             _buildStatChangeRow(
               "LUCK",
               player.totalLuck,
@@ -536,14 +537,14 @@ class InventoryScreen extends StatelessWidget {
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(ctx),
-            child: const Text("Cancel"),
+            child: const Text(AppStrings.cancel),
           ),
           ElevatedButton(
             onPressed: () {
               provider.equipItem(newItem);
               Navigator.pop(ctx);
             },
-            child: const Text("Confirm"),
+            child: const Text(AppStrings.confirm),
           ),
         ],
       ),
@@ -582,27 +583,27 @@ class InventoryScreen extends StatelessWidget {
           mainAxisSize: MainAxisSize.min,
           children: [
             Text(
-              "Unequip ${itemToUnequip.name}?",
+              "${AppStrings.unequip} ${itemToUnequip.name}?",
               style: const TextStyle(fontWeight: ThemeConfig.fontWeightBold),
             ),
             const SizedBox(height: 16),
             _buildStatChangeRow("Max HP", currentMaxHp, newMaxHp),
             _buildStatChangeRow("Current HP", currentHp, newHp),
-            _buildStatChangeRow("ATK", currentAtk, newAtk),
-            _buildStatChangeRow("DEF", currentDef, newDef),
+            _buildStatChangeRow(AppStrings.atk, currentAtk, newAtk),
+            _buildStatChangeRow(AppStrings.def, currentDef, newDef),
           ],
         ),
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(ctx),
-            child: const Text("Cancel"),
+            child: const Text(AppStrings.cancel),
           ),
           ElevatedButton(
             onPressed: () {
               provider.unequipItem(itemToUnequip);
               Navigator.pop(ctx);
             },
-            child: const Text("Confirm"),
+            child: const Text(AppStrings.confirm),
           ),
         ],
       ),
@@ -657,10 +658,10 @@ class InventoryScreen extends StatelessWidget {
 
   Widget _buildItemStatText(Item item) {
     List<String> stats = [];
-    if (item.atkBonus > 0) stats.add("+${item.atkBonus} ATK");
-    if (item.hpBonus > 0) stats.add("+${item.hpBonus} HP");
-    if (item.armorBonus > 0) stats.add("+${item.armorBonus} DEF");
-    if (item.luck > 0) stats.add("+${item.luck} Luck");
+    if (item.atkBonus > 0) stats.add("+${item.atkBonus} ${AppStrings.atk}");
+    if (item.hpBonus > 0) stats.add("+${item.hpBonus} ${AppStrings.hp}");
+    if (item.armorBonus > 0) stats.add("+${item.armorBonus} ${AppStrings.def}");
+    if (item.luck > 0) stats.add("+${item.luck} ${AppStrings.luck}");
 
     // Include effects
     List<String> effectTexts = item.effects.map((e) => e.description).toList();
diff --git a/lib/screens/main_menu_screen.dart b/lib/screens/main_menu_screen.dart
index 37a22bf..7e844fa 100644
--- a/lib/screens/main_menu_screen.dart
+++ b/lib/screens/main_menu_screen.dart
@@ -6,6 +6,7 @@ import '../widgets/responsive_container.dart';
 import '../game/save_manager.dart';
 import '../providers/battle_provider.dart';
 import '../game/config/theme_config.dart';
+import '../game/config/app_strings.dart';
 
 class MainMenuScreen extends StatefulWidget {
   const MainMenuScreen({super.key});
@@ -79,7 +80,7 @@ class _MainMenuScreenState extends State<MainMenuScreen> {
                     ),
                     const SizedBox(height: 20),
                     const Text(
-                      "COLOSSEUM'S CHOICE",
+                      AppStrings.gameTitle,
                       style: TextStyle(
                         fontSize: ThemeConfig.fontSizeHero,
                         fontWeight: ThemeConfig.fontWeightBold,
@@ -112,7 +113,7 @@ class _MainMenuScreenState extends State<MainMenuScreen> {
                             fontWeight: ThemeConfig.fontWeightBold,
                           ),
                         ),
-                        child: const Text("CONTINUE"),
+                        child: const Text(AppStrings.continueGame),
                       ),
                       const SizedBox(height: 20),
                     ],
@@ -139,7 +140,7 @@ class _MainMenuScreenState extends State<MainMenuScreen> {
                           fontWeight: ThemeConfig.fontWeightBold,
                         ),
                       ),
-                      child: const Text("NEW GAME"),
+                      child: const Text(AppStrings.startGame),
                     ),
                   ],
                 ),
diff --git a/lib/screens/settings_screen.dart b/lib/screens/settings_screen.dart
index c00175d..05889f3 100644
--- a/lib/screens/settings_screen.dart
+++ b/lib/screens/settings_screen.dart
@@ -3,6 +3,7 @@ import 'package:provider/provider.dart';
 import '../providers/battle_provider.dart';
 import 'main_menu_screen.dart';
 import '../game/config/theme_config.dart';
+import '../game/config/app_strings.dart';
 
 class SettingsScreen extends StatelessWidget {
   const SettingsScreen({super.key});
@@ -14,7 +15,7 @@ class SettingsScreen extends StatelessWidget {
         mainAxisAlignment: MainAxisAlignment.center,
         children: [
           const Text(
-            'Settings',
+            AppStrings.settings,
             style: TextStyle(
               fontSize: ThemeConfig.fontSizeTitle,
               fontWeight: ThemeConfig.fontWeightBold,
@@ -43,7 +44,7 @@ class SettingsScreen extends StatelessWidget {
             onPressed: () {
               _showConfirmationDialog(
                 context,
-                title: 'Restart Game?',
+                title: '${AppStrings.restart} Game?',
                 content: 'All progress will be lost. Are you sure?',
                 onConfirm: () {
                   context.read<BattleProvider>().initializeBattle();
@@ -70,7 +71,7 @@ class SettingsScreen extends StatelessWidget {
             onPressed: () {
               _showConfirmationDialog(
                 context,
-                title: 'Return to Main Menu?',
+                title: '${AppStrings.returnToMenu}?',
                 content: 'Unsaved progress may be lost. (Progress is saved automatically after each stage)',
                 onConfirm: () {
                    Navigator.of(context).pushAndRemoveUntil(
@@ -80,7 +81,7 @@ class SettingsScreen extends StatelessWidget {
                 },
               );
             },
-            child: const Text('Return to Main Menu'),
+            child: const Text(AppStrings.returnToMenu),
           ),
         ],
       ),
@@ -96,14 +97,14 @@ class SettingsScreen extends StatelessWidget {
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(context),
-            child: const Text('Cancel'),
+            child: const Text(AppStrings.cancel),
           ),
           TextButton(
             onPressed: () {
               Navigator.pop(context);
               onConfirm();
             },
-            child: const Text('Confirm', style: TextStyle(color: Colors.red)),
+            child: const Text(AppStrings.confirm, style: TextStyle(color: Colors.red)),
           ),
         ],
       ),
diff --git a/prompt/60_introduce_app_strings.md b/prompt/60_introduce_app_strings.md
new file mode 100644
index 0000000..3d9cbef
--- /dev/null
+++ b/prompt/60_introduce_app_strings.md
@@ -0,0 +1,16 @@
+# 60. Introduce AppStrings for Soft i18n
+
+## 1. 목표 (Goal)
+- UI 텍스트 하드코딩을 방지하고 추후 본격적인 i18n 적용을 대비하기 위해 `AppStrings` 상수 클래스를 도입합니다.
+- 자주 사용되는 UI 텍스트(메뉴, 스탯, 행동 등)를 한 곳에서 관리합니다.
+
+## 2. 구현 계획 (Implementation Plan)
+1.  **`lib/game/config/app_strings.dart` 생성:**
+    - `actionAttack`, `actionDefend`, `statHp`, `statAtk` 등 카테고리별로 정적 상수를 정의합니다.
+2.  **UI 코드 수정:**
+    - `BattleScreen`, `InventoryScreen`, `MainMenuScreen` 등에서 하드코딩된 문자열을 `AppStrings.xxx`로 교체합니다.
+    - *Note:* 전투 로그와 같이 동적으로 생성되는 복잡한 문장은 이번 단계에서 제외합니다.
+
+## 3. 기대 효과 (Expected Outcome)
+- 텍스트 변경 시 `AppStrings`만 수정하면 되므로 유지보수성 향상.
+- 추후 다국어 지원 라이브러리 도입 시 마이그레이션이 매우 쉬워짐.