diff --git a/lib/src/core/model/cumulative_statistics.dart b/lib/src/core/model/cumulative_statistics.dart
new file mode 100644
index 0000000..f8e139a
--- /dev/null
+++ b/lib/src/core/model/cumulative_statistics.dart
@@ -0,0 +1,276 @@
+import 'package:asciineverdie/src/core/model/session_statistics.dart';
+
+/// 누적 통계 (Cumulative Statistics)
+///
+/// GameStatistics에서 분리된 모든 게임 세션의 누적 통계 모델.
+class CumulativeStatistics {
+  const CumulativeStatistics({
+    required this.totalPlayTimeMs,
+    required this.totalMonstersKilled,
+    required this.totalGoldEarned,
+    required this.totalGoldSpent,
+    required this.totalSkillsUsed,
+    required this.totalCriticalHits,
+    required this.bestCriticalStreak,
+    required this.totalDamageDealt,
+    required this.totalDamageTaken,
+    required this.totalPotionsUsed,
+    required this.totalItemsSold,
+    required this.totalQuestsCompleted,
+    required this.totalDeaths,
+    required this.totalBossesDefeated,
+    required this.totalLevelUps,
+    required this.highestLevel,
+    required this.highestGoldHeld,
+    required this.gamesCompleted,
+    required this.gamesStarted,
+  });
+
+  /// 총 플레이 시간 (밀리초)
+  final int totalPlayTimeMs;
+
+  /// 총 처치한 몬스터 수
+  final int totalMonstersKilled;
+
+  /// 총 획득한 골드
+  final int totalGoldEarned;
+
+  /// 총 소비한 골드
+  final int totalGoldSpent;
+
+  /// 총 스킬 사용 횟수
+  final int totalSkillsUsed;
+
+  /// 총 크리티컬 히트 횟수
+  final int totalCriticalHits;
+
+  /// 최고 연속 크리티컬
+  final int bestCriticalStreak;
+
+  /// 총 입힌 데미지
+  final int totalDamageDealt;
+
+  /// 총 받은 데미지
+  final int totalDamageTaken;
+
+  /// 총 사용한 물약 수
+  final int totalPotionsUsed;
+
+  /// 총 판매한 아이템 수
+  final int totalItemsSold;
+
+  /// 총 완료한 퀘스트 수
+  final int totalQuestsCompleted;
+
+  /// 총 사망 횟수
+  final int totalDeaths;
+
+  /// 총 처치한 보스 수
+  final int totalBossesDefeated;
+
+  /// 총 레벨업 횟수
+  final int totalLevelUps;
+
+  /// 최고 달성 레벨
+  final int highestLevel;
+
+  /// 최대 보유 골드
+  final int highestGoldHeld;
+
+  /// 클리어한 게임 수
+  final int gamesCompleted;
+
+  /// 시작한 게임 수
+  final int gamesStarted;
+
+  /// 총 플레이 시간 Duration
+  Duration get totalPlayTime => Duration(milliseconds: totalPlayTimeMs);
+
+  /// 총 플레이 시간 포맷 (HH:MM:SS)
+  String get formattedTotalPlayTime {
+    final hours = totalPlayTime.inHours;
+    final minutes = totalPlayTime.inMinutes % 60;
+    final seconds = totalPlayTime.inSeconds % 60;
+    return '${hours.toString().padLeft(2, '0')}:'
+        '${minutes.toString().padLeft(2, '0')}:'
+        '${seconds.toString().padLeft(2, '0')}';
+  }
+
+  /// 평균 게임당 플레이 시간
+  Duration get averagePlayTimePerGame {
+    if (gamesStarted <= 0) return Duration.zero;
+    return Duration(milliseconds: totalPlayTimeMs ~/ gamesStarted);
+  }
+
+  /// 게임 완료율
+  double get completionRate {
+    if (gamesStarted <= 0) return 0;
+    return gamesCompleted / gamesStarted;
+  }
+
+  /// 빈 누적 통계
+  factory CumulativeStatistics.empty() => const CumulativeStatistics(
+    totalPlayTimeMs: 0,
+    totalMonstersKilled: 0,
+    totalGoldEarned: 0,
+    totalGoldSpent: 0,
+    totalSkillsUsed: 0,
+    totalCriticalHits: 0,
+    bestCriticalStreak: 0,
+    totalDamageDealt: 0,
+    totalDamageTaken: 0,
+    totalPotionsUsed: 0,
+    totalItemsSold: 0,
+    totalQuestsCompleted: 0,
+    totalDeaths: 0,
+    totalBossesDefeated: 0,
+    totalLevelUps: 0,
+    highestLevel: 0,
+    highestGoldHeld: 0,
+    gamesCompleted: 0,
+    gamesStarted: 0,
+  );
+
+  /// 세션 통계 병합
+  CumulativeStatistics mergeSession(SessionStatistics session) {
+    return CumulativeStatistics(
+      totalPlayTimeMs: totalPlayTimeMs + session.playTimeMs,
+      totalMonstersKilled: totalMonstersKilled + session.monstersKilled,
+      totalGoldEarned: totalGoldEarned + session.goldEarned,
+      totalGoldSpent: totalGoldSpent + session.goldSpent,
+      totalSkillsUsed: totalSkillsUsed + session.skillsUsed,
+      totalCriticalHits: totalCriticalHits + session.criticalHits,
+      bestCriticalStreak: session.maxCriticalStreak > bestCriticalStreak
+          ? session.maxCriticalStreak
+          : bestCriticalStreak,
+      totalDamageDealt: totalDamageDealt + session.totalDamageDealt,
+      totalDamageTaken: totalDamageTaken + session.totalDamageTaken,
+      totalPotionsUsed: totalPotionsUsed + session.potionsUsed,
+      totalItemsSold: totalItemsSold + session.itemsSold,
+      totalQuestsCompleted: totalQuestsCompleted + session.questsCompleted,
+      totalDeaths: totalDeaths + session.deathCount,
+      totalBossesDefeated: totalBossesDefeated + session.bossesDefeated,
+      totalLevelUps: totalLevelUps + session.levelUps,
+      highestLevel: highestLevel,
+      highestGoldHeld: highestGoldHeld,
+      gamesCompleted: gamesCompleted,
+      gamesStarted: gamesStarted,
+    );
+  }
+
+  /// 최고 레벨 업데이트
+  CumulativeStatistics updateHighestLevel(int level) {
+    if (level <= highestLevel) return this;
+    return copyWith(highestLevel: level);
+  }
+
+  /// 최대 골드 업데이트
+  CumulativeStatistics updateHighestGold(int gold) {
+    if (gold <= highestGoldHeld) return this;
+    return copyWith(highestGoldHeld: gold);
+  }
+
+  /// 새 게임 시작 기록
+  CumulativeStatistics recordGameStart() {
+    return copyWith(gamesStarted: gamesStarted + 1);
+  }
+
+  /// 게임 클리어 기록
+  CumulativeStatistics recordGameComplete() {
+    return copyWith(gamesCompleted: gamesCompleted + 1);
+  }
+
+  CumulativeStatistics copyWith({
+    int? totalPlayTimeMs,
+    int? totalMonstersKilled,
+    int? totalGoldEarned,
+    int? totalGoldSpent,
+    int? totalSkillsUsed,
+    int? totalCriticalHits,
+    int? bestCriticalStreak,
+    int? totalDamageDealt,
+    int? totalDamageTaken,
+    int? totalPotionsUsed,
+    int? totalItemsSold,
+    int? totalQuestsCompleted,
+    int? totalDeaths,
+    int? totalBossesDefeated,
+    int? totalLevelUps,
+    int? highestLevel,
+    int? highestGoldHeld,
+    int? gamesCompleted,
+    int? gamesStarted,
+  }) {
+    return CumulativeStatistics(
+      totalPlayTimeMs: totalPlayTimeMs ?? this.totalPlayTimeMs,
+      totalMonstersKilled: totalMonstersKilled ?? this.totalMonstersKilled,
+      totalGoldEarned: totalGoldEarned ?? this.totalGoldEarned,
+      totalGoldSpent: totalGoldSpent ?? this.totalGoldSpent,
+      totalSkillsUsed: totalSkillsUsed ?? this.totalSkillsUsed,
+      totalCriticalHits: totalCriticalHits ?? this.totalCriticalHits,
+      bestCriticalStreak: bestCriticalStreak ?? this.bestCriticalStreak,
+      totalDamageDealt: totalDamageDealt ?? this.totalDamageDealt,
+      totalDamageTaken: totalDamageTaken ?? this.totalDamageTaken,
+      totalPotionsUsed: totalPotionsUsed ?? this.totalPotionsUsed,
+      totalItemsSold: totalItemsSold ?? this.totalItemsSold,
+      totalQuestsCompleted: totalQuestsCompleted ?? this.totalQuestsCompleted,
+      totalDeaths: totalDeaths ?? this.totalDeaths,
+      totalBossesDefeated: totalBossesDefeated ?? this.totalBossesDefeated,
+      totalLevelUps: totalLevelUps ?? this.totalLevelUps,
+      highestLevel: highestLevel ?? this.highestLevel,
+      highestGoldHeld: highestGoldHeld ?? this.highestGoldHeld,
+      gamesCompleted: gamesCompleted ?? this.gamesCompleted,
+      gamesStarted: gamesStarted ?? this.gamesStarted,
+    );
+  }
+
+  /// JSON 직렬화
+  Map<String, dynamic> toJson() {
+    return {
+      'totalPlayTimeMs': totalPlayTimeMs,
+      'totalMonstersKilled': totalMonstersKilled,
+      'totalGoldEarned': totalGoldEarned,
+      'totalGoldSpent': totalGoldSpent,
+      'totalSkillsUsed': totalSkillsUsed,
+      'totalCriticalHits': totalCriticalHits,
+      'bestCriticalStreak': bestCriticalStreak,
+      'totalDamageDealt': totalDamageDealt,
+      'totalDamageTaken': totalDamageTaken,
+      'totalPotionsUsed': totalPotionsUsed,
+      'totalItemsSold': totalItemsSold,
+      'totalQuestsCompleted': totalQuestsCompleted,
+      'totalDeaths': totalDeaths,
+      'totalBossesDefeated': totalBossesDefeated,
+      'totalLevelUps': totalLevelUps,
+      'highestLevel': highestLevel,
+      'highestGoldHeld': highestGoldHeld,
+      'gamesCompleted': gamesCompleted,
+      'gamesStarted': gamesStarted,
+    };
+  }
+
+  /// JSON 역직렬화
+  factory CumulativeStatistics.fromJson(Map<String, dynamic> json) {
+    return CumulativeStatistics(
+      totalPlayTimeMs: json['totalPlayTimeMs'] as int? ?? 0,
+      totalMonstersKilled: json['totalMonstersKilled'] as int? ?? 0,
+      totalGoldEarned: json['totalGoldEarned'] as int? ?? 0,
+      totalGoldSpent: json['totalGoldSpent'] as int? ?? 0,
+      totalSkillsUsed: json['totalSkillsUsed'] as int? ?? 0,
+      totalCriticalHits: json['totalCriticalHits'] as int? ?? 0,
+      bestCriticalStreak: json['bestCriticalStreak'] as int? ?? 0,
+      totalDamageDealt: json['totalDamageDealt'] as int? ?? 0,
+      totalDamageTaken: json['totalDamageTaken'] as int? ?? 0,
+      totalPotionsUsed: json['totalPotionsUsed'] as int? ?? 0,
+      totalItemsSold: json['totalItemsSold'] as int? ?? 0,
+      totalQuestsCompleted: json['totalQuestsCompleted'] as int? ?? 0,
+      totalDeaths: json['totalDeaths'] as int? ?? 0,
+      totalBossesDefeated: json['totalBossesDefeated'] as int? ?? 0,
+      totalLevelUps: json['totalLevelUps'] as int? ?? 0,
+      highestLevel: json['highestLevel'] as int? ?? 0,
+      highestGoldHeld: json['highestGoldHeld'] as int? ?? 0,
+      gamesCompleted: json['gamesCompleted'] as int? ?? 0,
+      gamesStarted: json['gamesStarted'] as int? ?? 0,
+    );
+  }
+}
diff --git a/lib/src/core/model/game_statistics.dart b/lib/src/core/model/game_statistics.dart
index e91fd24..fb56e38 100644
--- a/lib/src/core/model/game_statistics.dart
+++ b/lib/src/core/model/game_statistics.dart
@@ -1,6 +1,14 @@
+import 'package:asciineverdie/src/core/model/cumulative_statistics.dart';
+import 'package:asciineverdie/src/core/model/session_statistics.dart';
+
+// 하위 호환성(backward compatibility)을 위한 re-export
+export 'package:asciineverdie/src/core/model/cumulative_statistics.dart';
+export 'package:asciineverdie/src/core/model/session_statistics.dart';
+
 /// 게임 통계 (Game Statistics)
 ///
-/// 세션 및 누적 통계를 추적하는 모델
+/// 세션 및 누적 통계를 추적하는 모델.
+/// 세부 구현은 SessionStatistics와 CumulativeStatistics로 분리됨.
 class GameStatistics {
   const GameStatistics({required this.session, required this.cumulative});
 
@@ -59,558 +67,3 @@ class GameStatistics {
     );
   }
 }
-
-/// 세션 통계 (Session Statistics)
-///
-/// 현재 게임 세션의 통계
-class SessionStatistics {
-  const SessionStatistics({
-    required this.playTimeMs,
-    required this.monstersKilled,
-    required this.goldEarned,
-    required this.goldSpent,
-    required this.skillsUsed,
-    required this.criticalHits,
-    required this.maxCriticalStreak,
-    required this.currentCriticalStreak,
-    required this.totalDamageDealt,
-    required this.totalDamageTaken,
-    required this.potionsUsed,
-    required this.itemsSold,
-    required this.questsCompleted,
-    required this.deathCount,
-    required this.bossesDefeated,
-    required this.levelUps,
-  });
-
-  /// 플레이 시간 (밀리초)
-  final int playTimeMs;
-
-  /// 처치한 몬스터 수
-  final int monstersKilled;
-
-  /// 획득한 골드 총량
-  final int goldEarned;
-
-  /// 소비한 골드 총량
-  final int goldSpent;
-
-  /// 사용한 스킬 횟수
-  final int skillsUsed;
-
-  /// 크리티컬 히트 횟수
-  final int criticalHits;
-
-  /// 최대 연속 크리티컬
-  final int maxCriticalStreak;
-
-  /// 현재 연속 크리티컬 (내부 추적용)
-  final int currentCriticalStreak;
-
-  /// 총 입힌 데미지
-  final int totalDamageDealt;
-
-  /// 총 받은 데미지
-  final int totalDamageTaken;
-
-  /// 사용한 물약 수
-  final int potionsUsed;
-
-  /// 판매한 아이템 수
-  final int itemsSold;
-
-  /// 완료한 퀘스트 수
-  final int questsCompleted;
-
-  /// 사망 횟수
-  final int deathCount;
-
-  /// 처치한 보스 수
-  final int bossesDefeated;
-
-  /// 레벨업 횟수
-  final int levelUps;
-
-  /// 플레이 시간 Duration
-  Duration get playTime => Duration(milliseconds: playTimeMs);
-
-  /// 플레이 시간 포맷 (HH:MM:SS)
-  String get formattedPlayTime {
-    final hours = playTime.inHours;
-    final minutes = playTime.inMinutes % 60;
-    final seconds = playTime.inSeconds % 60;
-    return '${hours.toString().padLeft(2, '0')}:'
-        '${minutes.toString().padLeft(2, '0')}:'
-        '${seconds.toString().padLeft(2, '0')}';
-  }
-
-  /// 평균 DPS (damage per second)
-  double get averageDps {
-    if (playTimeMs <= 0) return 0;
-    return totalDamageDealt / (playTimeMs / 1000);
-  }
-
-  /// 킬당 평균 골드
-  double get goldPerKill {
-    if (monstersKilled <= 0) return 0;
-    return goldEarned / monstersKilled;
-  }
-
-  /// 크리티컬 비율
-  double get criticalRate {
-    if (skillsUsed <= 0) return 0;
-    return criticalHits / skillsUsed;
-  }
-
-  /// 빈 세션 통계
-  factory SessionStatistics.empty() => const SessionStatistics(
-    playTimeMs: 0,
-    monstersKilled: 0,
-    goldEarned: 0,
-    goldSpent: 0,
-    skillsUsed: 0,
-    criticalHits: 0,
-    maxCriticalStreak: 0,
-    currentCriticalStreak: 0,
-    totalDamageDealt: 0,
-    totalDamageTaken: 0,
-    potionsUsed: 0,
-    itemsSold: 0,
-    questsCompleted: 0,
-    deathCount: 0,
-    bossesDefeated: 0,
-    levelUps: 0,
-  );
-
-  // ============================================================================
-  // 이벤트 기록 메서드
-  // ============================================================================
-
-  /// 몬스터 처치 기록
-  SessionStatistics recordKill({bool isBoss = false}) {
-    return copyWith(
-      monstersKilled: monstersKilled + 1,
-      bossesDefeated: isBoss ? bossesDefeated + 1 : bossesDefeated,
-    );
-  }
-
-  /// 골드 획득 기록
-  SessionStatistics recordGoldEarned(int amount) {
-    return copyWith(goldEarned: goldEarned + amount);
-  }
-
-  /// 골드 소비 기록
-  SessionStatistics recordGoldSpent(int amount) {
-    return copyWith(goldSpent: goldSpent + amount);
-  }
-
-  /// 스킬 사용 기록
-  SessionStatistics recordSkillUse({required bool isCritical}) {
-    final newCriticalStreak = isCritical ? currentCriticalStreak + 1 : 0;
-    final newMaxStreak = newCriticalStreak > maxCriticalStreak
-        ? newCriticalStreak
-        : maxCriticalStreak;
-
-    return copyWith(
-      skillsUsed: skillsUsed + 1,
-      criticalHits: isCritical ? criticalHits + 1 : criticalHits,
-      currentCriticalStreak: newCriticalStreak,
-      maxCriticalStreak: newMaxStreak,
-    );
-  }
-
-  /// 데미지 기록
-  SessionStatistics recordDamage({int dealt = 0, int taken = 0}) {
-    return copyWith(
-      totalDamageDealt: totalDamageDealt + dealt,
-      totalDamageTaken: totalDamageTaken + taken,
-    );
-  }
-
-  /// 물약 사용 기록
-  SessionStatistics recordPotionUse() {
-    return copyWith(potionsUsed: potionsUsed + 1);
-  }
-
-  /// 아이템 판매 기록
-  SessionStatistics recordItemSold(int count) {
-    return copyWith(itemsSold: itemsSold + count);
-  }
-
-  /// 퀘스트 완료 기록
-  SessionStatistics recordQuestComplete() {
-    return copyWith(questsCompleted: questsCompleted + 1);
-  }
-
-  /// 사망 기록
-  SessionStatistics recordDeath() {
-    return copyWith(deathCount: deathCount + 1);
-  }
-
-  /// 레벨업 기록
-  SessionStatistics recordLevelUp() {
-    return copyWith(levelUps: levelUps + 1);
-  }
-
-  /// 플레이 시간 업데이트
-  SessionStatistics updatePlayTime(int elapsedMs) {
-    return copyWith(playTimeMs: elapsedMs);
-  }
-
-  SessionStatistics copyWith({
-    int? playTimeMs,
-    int? monstersKilled,
-    int? goldEarned,
-    int? goldSpent,
-    int? skillsUsed,
-    int? criticalHits,
-    int? maxCriticalStreak,
-    int? currentCriticalStreak,
-    int? totalDamageDealt,
-    int? totalDamageTaken,
-    int? potionsUsed,
-    int? itemsSold,
-    int? questsCompleted,
-    int? deathCount,
-    int? bossesDefeated,
-    int? levelUps,
-  }) {
-    return SessionStatistics(
-      playTimeMs: playTimeMs ?? this.playTimeMs,
-      monstersKilled: monstersKilled ?? this.monstersKilled,
-      goldEarned: goldEarned ?? this.goldEarned,
-      goldSpent: goldSpent ?? this.goldSpent,
-      skillsUsed: skillsUsed ?? this.skillsUsed,
-      criticalHits: criticalHits ?? this.criticalHits,
-      maxCriticalStreak: maxCriticalStreak ?? this.maxCriticalStreak,
-      currentCriticalStreak:
-          currentCriticalStreak ?? this.currentCriticalStreak,
-      totalDamageDealt: totalDamageDealt ?? this.totalDamageDealt,
-      totalDamageTaken: totalDamageTaken ?? this.totalDamageTaken,
-      potionsUsed: potionsUsed ?? this.potionsUsed,
-      itemsSold: itemsSold ?? this.itemsSold,
-      questsCompleted: questsCompleted ?? this.questsCompleted,
-      deathCount: deathCount ?? this.deathCount,
-      bossesDefeated: bossesDefeated ?? this.bossesDefeated,
-      levelUps: levelUps ?? this.levelUps,
-    );
-  }
-
-  /// JSON 직렬화
-  Map<String, dynamic> toJson() {
-    return {
-      'playTimeMs': playTimeMs,
-      'monstersKilled': monstersKilled,
-      'goldEarned': goldEarned,
-      'goldSpent': goldSpent,
-      'skillsUsed': skillsUsed,
-      'criticalHits': criticalHits,
-      'maxCriticalStreak': maxCriticalStreak,
-      'totalDamageDealt': totalDamageDealt,
-      'totalDamageTaken': totalDamageTaken,
-      'potionsUsed': potionsUsed,
-      'itemsSold': itemsSold,
-      'questsCompleted': questsCompleted,
-      'deathCount': deathCount,
-      'bossesDefeated': bossesDefeated,
-      'levelUps': levelUps,
-    };
-  }
-
-  /// JSON 역직렬화
-  factory SessionStatistics.fromJson(Map<String, dynamic> json) {
-    return SessionStatistics(
-      playTimeMs: json['playTimeMs'] as int? ?? 0,
-      monstersKilled: json['monstersKilled'] as int? ?? 0,
-      goldEarned: json['goldEarned'] as int? ?? 0,
-      goldSpent: json['goldSpent'] as int? ?? 0,
-      skillsUsed: json['skillsUsed'] as int? ?? 0,
-      criticalHits: json['criticalHits'] as int? ?? 0,
-      maxCriticalStreak: json['maxCriticalStreak'] as int? ?? 0,
-      currentCriticalStreak: 0, // 세션간 유지 안 함
-      totalDamageDealt: json['totalDamageDealt'] as int? ?? 0,
-      totalDamageTaken: json['totalDamageTaken'] as int? ?? 0,
-      potionsUsed: json['potionsUsed'] as int? ?? 0,
-      itemsSold: json['itemsSold'] as int? ?? 0,
-      questsCompleted: json['questsCompleted'] as int? ?? 0,
-      deathCount: json['deathCount'] as int? ?? 0,
-      bossesDefeated: json['bossesDefeated'] as int? ?? 0,
-      levelUps: json['levelUps'] as int? ?? 0,
-    );
-  }
-}
-
-/// 누적 통계 (Cumulative Statistics)
-///
-/// 모든 게임 세션의 누적 통계
-class CumulativeStatistics {
-  const CumulativeStatistics({
-    required this.totalPlayTimeMs,
-    required this.totalMonstersKilled,
-    required this.totalGoldEarned,
-    required this.totalGoldSpent,
-    required this.totalSkillsUsed,
-    required this.totalCriticalHits,
-    required this.bestCriticalStreak,
-    required this.totalDamageDealt,
-    required this.totalDamageTaken,
-    required this.totalPotionsUsed,
-    required this.totalItemsSold,
-    required this.totalQuestsCompleted,
-    required this.totalDeaths,
-    required this.totalBossesDefeated,
-    required this.totalLevelUps,
-    required this.highestLevel,
-    required this.highestGoldHeld,
-    required this.gamesCompleted,
-    required this.gamesStarted,
-  });
-
-  /// 총 플레이 시간 (밀리초)
-  final int totalPlayTimeMs;
-
-  /// 총 처치한 몬스터 수
-  final int totalMonstersKilled;
-
-  /// 총 획득한 골드
-  final int totalGoldEarned;
-
-  /// 총 소비한 골드
-  final int totalGoldSpent;
-
-  /// 총 스킬 사용 횟수
-  final int totalSkillsUsed;
-
-  /// 총 크리티컬 히트 횟수
-  final int totalCriticalHits;
-
-  /// 최고 연속 크리티컬
-  final int bestCriticalStreak;
-
-  /// 총 입힌 데미지
-  final int totalDamageDealt;
-
-  /// 총 받은 데미지
-  final int totalDamageTaken;
-
-  /// 총 사용한 물약 수
-  final int totalPotionsUsed;
-
-  /// 총 판매한 아이템 수
-  final int totalItemsSold;
-
-  /// 총 완료한 퀘스트 수
-  final int totalQuestsCompleted;
-
-  /// 총 사망 횟수
-  final int totalDeaths;
-
-  /// 총 처치한 보스 수
-  final int totalBossesDefeated;
-
-  /// 총 레벨업 횟수
-  final int totalLevelUps;
-
-  /// 최고 달성 레벨
-  final int highestLevel;
-
-  /// 최대 보유 골드
-  final int highestGoldHeld;
-
-  /// 클리어한 게임 수
-  final int gamesCompleted;
-
-  /// 시작한 게임 수
-  final int gamesStarted;
-
-  /// 총 플레이 시간 Duration
-  Duration get totalPlayTime => Duration(milliseconds: totalPlayTimeMs);
-
-  /// 총 플레이 시간 포맷 (HH:MM:SS)
-  String get formattedTotalPlayTime {
-    final hours = totalPlayTime.inHours;
-    final minutes = totalPlayTime.inMinutes % 60;
-    final seconds = totalPlayTime.inSeconds % 60;
-    return '${hours.toString().padLeft(2, '0')}:'
-        '${minutes.toString().padLeft(2, '0')}:'
-        '${seconds.toString().padLeft(2, '0')}';
-  }
-
-  /// 평균 게임당 플레이 시간
-  Duration get averagePlayTimePerGame {
-    if (gamesStarted <= 0) return Duration.zero;
-    return Duration(milliseconds: totalPlayTimeMs ~/ gamesStarted);
-  }
-
-  /// 게임 완료율
-  double get completionRate {
-    if (gamesStarted <= 0) return 0;
-    return gamesCompleted / gamesStarted;
-  }
-
-  /// 빈 누적 통계
-  factory CumulativeStatistics.empty() => const CumulativeStatistics(
-    totalPlayTimeMs: 0,
-    totalMonstersKilled: 0,
-    totalGoldEarned: 0,
-    totalGoldSpent: 0,
-    totalSkillsUsed: 0,
-    totalCriticalHits: 0,
-    bestCriticalStreak: 0,
-    totalDamageDealt: 0,
-    totalDamageTaken: 0,
-    totalPotionsUsed: 0,
-    totalItemsSold: 0,
-    totalQuestsCompleted: 0,
-    totalDeaths: 0,
-    totalBossesDefeated: 0,
-    totalLevelUps: 0,
-    highestLevel: 0,
-    highestGoldHeld: 0,
-    gamesCompleted: 0,
-    gamesStarted: 0,
-  );
-
-  /// 세션 통계 병합
-  CumulativeStatistics mergeSession(SessionStatistics session) {
-    return CumulativeStatistics(
-      totalPlayTimeMs: totalPlayTimeMs + session.playTimeMs,
-      totalMonstersKilled: totalMonstersKilled + session.monstersKilled,
-      totalGoldEarned: totalGoldEarned + session.goldEarned,
-      totalGoldSpent: totalGoldSpent + session.goldSpent,
-      totalSkillsUsed: totalSkillsUsed + session.skillsUsed,
-      totalCriticalHits: totalCriticalHits + session.criticalHits,
-      bestCriticalStreak: session.maxCriticalStreak > bestCriticalStreak
-          ? session.maxCriticalStreak
-          : bestCriticalStreak,
-      totalDamageDealt: totalDamageDealt + session.totalDamageDealt,
-      totalDamageTaken: totalDamageTaken + session.totalDamageTaken,
-      totalPotionsUsed: totalPotionsUsed + session.potionsUsed,
-      totalItemsSold: totalItemsSold + session.itemsSold,
-      totalQuestsCompleted: totalQuestsCompleted + session.questsCompleted,
-      totalDeaths: totalDeaths + session.deathCount,
-      totalBossesDefeated: totalBossesDefeated + session.bossesDefeated,
-      totalLevelUps: totalLevelUps + session.levelUps,
-      highestLevel: highestLevel, // 별도 업데이트 필요
-      highestGoldHeld: highestGoldHeld, // 별도 업데이트 필요
-      gamesCompleted: gamesCompleted, // 별도 업데이트 필요
-      gamesStarted: gamesStarted, // 별도 업데이트 필요
-    );
-  }
-
-  /// 최고 레벨 업데이트
-  CumulativeStatistics updateHighestLevel(int level) {
-    if (level <= highestLevel) return this;
-    return copyWith(highestLevel: level);
-  }
-
-  /// 최대 골드 업데이트
-  CumulativeStatistics updateHighestGold(int gold) {
-    if (gold <= highestGoldHeld) return this;
-    return copyWith(highestGoldHeld: gold);
-  }
-
-  /// 새 게임 시작 기록
-  CumulativeStatistics recordGameStart() {
-    return copyWith(gamesStarted: gamesStarted + 1);
-  }
-
-  /// 게임 클리어 기록
-  CumulativeStatistics recordGameComplete() {
-    return copyWith(gamesCompleted: gamesCompleted + 1);
-  }
-
-  CumulativeStatistics copyWith({
-    int? totalPlayTimeMs,
-    int? totalMonstersKilled,
-    int? totalGoldEarned,
-    int? totalGoldSpent,
-    int? totalSkillsUsed,
-    int? totalCriticalHits,
-    int? bestCriticalStreak,
-    int? totalDamageDealt,
-    int? totalDamageTaken,
-    int? totalPotionsUsed,
-    int? totalItemsSold,
-    int? totalQuestsCompleted,
-    int? totalDeaths,
-    int? totalBossesDefeated,
-    int? totalLevelUps,
-    int? highestLevel,
-    int? highestGoldHeld,
-    int? gamesCompleted,
-    int? gamesStarted,
-  }) {
-    return CumulativeStatistics(
-      totalPlayTimeMs: totalPlayTimeMs ?? this.totalPlayTimeMs,
-      totalMonstersKilled: totalMonstersKilled ?? this.totalMonstersKilled,
-      totalGoldEarned: totalGoldEarned ?? this.totalGoldEarned,
-      totalGoldSpent: totalGoldSpent ?? this.totalGoldSpent,
-      totalSkillsUsed: totalSkillsUsed ?? this.totalSkillsUsed,
-      totalCriticalHits: totalCriticalHits ?? this.totalCriticalHits,
-      bestCriticalStreak: bestCriticalStreak ?? this.bestCriticalStreak,
-      totalDamageDealt: totalDamageDealt ?? this.totalDamageDealt,
-      totalDamageTaken: totalDamageTaken ?? this.totalDamageTaken,
-      totalPotionsUsed: totalPotionsUsed ?? this.totalPotionsUsed,
-      totalItemsSold: totalItemsSold ?? this.totalItemsSold,
-      totalQuestsCompleted: totalQuestsCompleted ?? this.totalQuestsCompleted,
-      totalDeaths: totalDeaths ?? this.totalDeaths,
-      totalBossesDefeated: totalBossesDefeated ?? this.totalBossesDefeated,
-      totalLevelUps: totalLevelUps ?? this.totalLevelUps,
-      highestLevel: highestLevel ?? this.highestLevel,
-      highestGoldHeld: highestGoldHeld ?? this.highestGoldHeld,
-      gamesCompleted: gamesCompleted ?? this.gamesCompleted,
-      gamesStarted: gamesStarted ?? this.gamesStarted,
-    );
-  }
-
-  /// JSON 직렬화
-  Map<String, dynamic> toJson() {
-    return {
-      'totalPlayTimeMs': totalPlayTimeMs,
-      'totalMonstersKilled': totalMonstersKilled,
-      'totalGoldEarned': totalGoldEarned,
-      'totalGoldSpent': totalGoldSpent,
-      'totalSkillsUsed': totalSkillsUsed,
-      'totalCriticalHits': totalCriticalHits,
-      'bestCriticalStreak': bestCriticalStreak,
-      'totalDamageDealt': totalDamageDealt,
-      'totalDamageTaken': totalDamageTaken,
-      'totalPotionsUsed': totalPotionsUsed,
-      'totalItemsSold': totalItemsSold,
-      'totalQuestsCompleted': totalQuestsCompleted,
-      'totalDeaths': totalDeaths,
-      'totalBossesDefeated': totalBossesDefeated,
-      'totalLevelUps': totalLevelUps,
-      'highestLevel': highestLevel,
-      'highestGoldHeld': highestGoldHeld,
-      'gamesCompleted': gamesCompleted,
-      'gamesStarted': gamesStarted,
-    };
-  }
-
-  /// JSON 역직렬화
-  factory CumulativeStatistics.fromJson(Map<String, dynamic> json) {
-    return CumulativeStatistics(
-      totalPlayTimeMs: json['totalPlayTimeMs'] as int? ?? 0,
-      totalMonstersKilled: json['totalMonstersKilled'] as int? ?? 0,
-      totalGoldEarned: json['totalGoldEarned'] as int? ?? 0,
-      totalGoldSpent: json['totalGoldSpent'] as int? ?? 0,
-      totalSkillsUsed: json['totalSkillsUsed'] as int? ?? 0,
-      totalCriticalHits: json['totalCriticalHits'] as int? ?? 0,
-      bestCriticalStreak: json['bestCriticalStreak'] as int? ?? 0,
-      totalDamageDealt: json['totalDamageDealt'] as int? ?? 0,
-      totalDamageTaken: json['totalDamageTaken'] as int? ?? 0,
-      totalPotionsUsed: json['totalPotionsUsed'] as int? ?? 0,
-      totalItemsSold: json['totalItemsSold'] as int? ?? 0,
-      totalQuestsCompleted: json['totalQuestsCompleted'] as int? ?? 0,
-      totalDeaths: json['totalDeaths'] as int? ?? 0,
-      totalBossesDefeated: json['totalBossesDefeated'] as int? ?? 0,
-      totalLevelUps: json['totalLevelUps'] as int? ?? 0,
-      highestLevel: json['highestLevel'] as int? ?? 0,
-      highestGoldHeld: json['highestGoldHeld'] as int? ?? 0,
-      gamesCompleted: json['gamesCompleted'] as int? ?? 0,
-      gamesStarted: json['gamesStarted'] as int? ?? 0,
-    );
-  }
-}
diff --git a/lib/src/core/model/session_statistics.dart b/lib/src/core/model/session_statistics.dart
new file mode 100644
index 0000000..26995a8
--- /dev/null
+++ b/lib/src/core/model/session_statistics.dart
@@ -0,0 +1,279 @@
+/// 세션 통계 (Session Statistics)
+///
+/// GameStatistics에서 분리된 현재 게임 세션의 통계 모델.
+class SessionStatistics {
+  const SessionStatistics({
+    required this.playTimeMs,
+    required this.monstersKilled,
+    required this.goldEarned,
+    required this.goldSpent,
+    required this.skillsUsed,
+    required this.criticalHits,
+    required this.maxCriticalStreak,
+    required this.currentCriticalStreak,
+    required this.totalDamageDealt,
+    required this.totalDamageTaken,
+    required this.potionsUsed,
+    required this.itemsSold,
+    required this.questsCompleted,
+    required this.deathCount,
+    required this.bossesDefeated,
+    required this.levelUps,
+  });
+
+  /// 플레이 시간 (밀리초)
+  final int playTimeMs;
+
+  /// 처치한 몬스터 수
+  final int monstersKilled;
+
+  /// 획득한 골드 총량
+  final int goldEarned;
+
+  /// 소비한 골드 총량
+  final int goldSpent;
+
+  /// 사용한 스킬 횟수
+  final int skillsUsed;
+
+  /// 크리티컬 히트 횟수
+  final int criticalHits;
+
+  /// 최대 연속 크리티컬
+  final int maxCriticalStreak;
+
+  /// 현재 연속 크리티컬 (내부 추적용)
+  final int currentCriticalStreak;
+
+  /// 총 입힌 데미지
+  final int totalDamageDealt;
+
+  /// 총 받은 데미지
+  final int totalDamageTaken;
+
+  /// 사용한 물약 수
+  final int potionsUsed;
+
+  /// 판매한 아이템 수
+  final int itemsSold;
+
+  /// 완료한 퀘스트 수
+  final int questsCompleted;
+
+  /// 사망 횟수
+  final int deathCount;
+
+  /// 처치한 보스 수
+  final int bossesDefeated;
+
+  /// 레벨업 횟수
+  final int levelUps;
+
+  /// 플레이 시간 Duration
+  Duration get playTime => Duration(milliseconds: playTimeMs);
+
+  /// 플레이 시간 포맷 (HH:MM:SS)
+  String get formattedPlayTime {
+    final hours = playTime.inHours;
+    final minutes = playTime.inMinutes % 60;
+    final seconds = playTime.inSeconds % 60;
+    return '${hours.toString().padLeft(2, '0')}:'
+        '${minutes.toString().padLeft(2, '0')}:'
+        '${seconds.toString().padLeft(2, '0')}';
+  }
+
+  /// 평균 DPS (damage per second)
+  double get averageDps {
+    if (playTimeMs <= 0) return 0;
+    return totalDamageDealt / (playTimeMs / 1000);
+  }
+
+  /// 킬당 평균 골드
+  double get goldPerKill {
+    if (monstersKilled <= 0) return 0;
+    return goldEarned / monstersKilled;
+  }
+
+  /// 크리티컬 비율
+  double get criticalRate {
+    if (skillsUsed <= 0) return 0;
+    return criticalHits / skillsUsed;
+  }
+
+  /// 빈 세션 통계
+  factory SessionStatistics.empty() => const SessionStatistics(
+    playTimeMs: 0,
+    monstersKilled: 0,
+    goldEarned: 0,
+    goldSpent: 0,
+    skillsUsed: 0,
+    criticalHits: 0,
+    maxCriticalStreak: 0,
+    currentCriticalStreak: 0,
+    totalDamageDealt: 0,
+    totalDamageTaken: 0,
+    potionsUsed: 0,
+    itemsSold: 0,
+    questsCompleted: 0,
+    deathCount: 0,
+    bossesDefeated: 0,
+    levelUps: 0,
+  );
+
+  // ============================================================================
+  // 이벤트 기록 메서드
+  // ============================================================================
+
+  /// 몬스터 처치 기록
+  SessionStatistics recordKill({bool isBoss = false}) {
+    return copyWith(
+      monstersKilled: monstersKilled + 1,
+      bossesDefeated: isBoss ? bossesDefeated + 1 : bossesDefeated,
+    );
+  }
+
+  /// 골드 획득 기록
+  SessionStatistics recordGoldEarned(int amount) {
+    return copyWith(goldEarned: goldEarned + amount);
+  }
+
+  /// 골드 소비 기록
+  SessionStatistics recordGoldSpent(int amount) {
+    return copyWith(goldSpent: goldSpent + amount);
+  }
+
+  /// 스킬 사용 기록
+  SessionStatistics recordSkillUse({required bool isCritical}) {
+    final newCriticalStreak = isCritical ? currentCriticalStreak + 1 : 0;
+    final newMaxStreak = newCriticalStreak > maxCriticalStreak
+        ? newCriticalStreak
+        : maxCriticalStreak;
+
+    return copyWith(
+      skillsUsed: skillsUsed + 1,
+      criticalHits: isCritical ? criticalHits + 1 : criticalHits,
+      currentCriticalStreak: newCriticalStreak,
+      maxCriticalStreak: newMaxStreak,
+    );
+  }
+
+  /// 데미지 기록
+  SessionStatistics recordDamage({int dealt = 0, int taken = 0}) {
+    return copyWith(
+      totalDamageDealt: totalDamageDealt + dealt,
+      totalDamageTaken: totalDamageTaken + taken,
+    );
+  }
+
+  /// 물약 사용 기록
+  SessionStatistics recordPotionUse() {
+    return copyWith(potionsUsed: potionsUsed + 1);
+  }
+
+  /// 아이템 판매 기록
+  SessionStatistics recordItemSold(int count) {
+    return copyWith(itemsSold: itemsSold + count);
+  }
+
+  /// 퀘스트 완료 기록
+  SessionStatistics recordQuestComplete() {
+    return copyWith(questsCompleted: questsCompleted + 1);
+  }
+
+  /// 사망 기록
+  SessionStatistics recordDeath() {
+    return copyWith(deathCount: deathCount + 1);
+  }
+
+  /// 레벨업 기록
+  SessionStatistics recordLevelUp() {
+    return copyWith(levelUps: levelUps + 1);
+  }
+
+  /// 플레이 시간 업데이트
+  SessionStatistics updatePlayTime(int elapsedMs) {
+    return copyWith(playTimeMs: elapsedMs);
+  }
+
+  SessionStatistics copyWith({
+    int? playTimeMs,
+    int? monstersKilled,
+    int? goldEarned,
+    int? goldSpent,
+    int? skillsUsed,
+    int? criticalHits,
+    int? maxCriticalStreak,
+    int? currentCriticalStreak,
+    int? totalDamageDealt,
+    int? totalDamageTaken,
+    int? potionsUsed,
+    int? itemsSold,
+    int? questsCompleted,
+    int? deathCount,
+    int? bossesDefeated,
+    int? levelUps,
+  }) {
+    return SessionStatistics(
+      playTimeMs: playTimeMs ?? this.playTimeMs,
+      monstersKilled: monstersKilled ?? this.monstersKilled,
+      goldEarned: goldEarned ?? this.goldEarned,
+      goldSpent: goldSpent ?? this.goldSpent,
+      skillsUsed: skillsUsed ?? this.skillsUsed,
+      criticalHits: criticalHits ?? this.criticalHits,
+      maxCriticalStreak: maxCriticalStreak ?? this.maxCriticalStreak,
+      currentCriticalStreak:
+          currentCriticalStreak ?? this.currentCriticalStreak,
+      totalDamageDealt: totalDamageDealt ?? this.totalDamageDealt,
+      totalDamageTaken: totalDamageTaken ?? this.totalDamageTaken,
+      potionsUsed: potionsUsed ?? this.potionsUsed,
+      itemsSold: itemsSold ?? this.itemsSold,
+      questsCompleted: questsCompleted ?? this.questsCompleted,
+      deathCount: deathCount ?? this.deathCount,
+      bossesDefeated: bossesDefeated ?? this.bossesDefeated,
+      levelUps: levelUps ?? this.levelUps,
+    );
+  }
+
+  /// JSON 직렬화
+  Map<String, dynamic> toJson() {
+    return {
+      'playTimeMs': playTimeMs,
+      'monstersKilled': monstersKilled,
+      'goldEarned': goldEarned,
+      'goldSpent': goldSpent,
+      'skillsUsed': skillsUsed,
+      'criticalHits': criticalHits,
+      'maxCriticalStreak': maxCriticalStreak,
+      'totalDamageDealt': totalDamageDealt,
+      'totalDamageTaken': totalDamageTaken,
+      'potionsUsed': potionsUsed,
+      'itemsSold': itemsSold,
+      'questsCompleted': questsCompleted,
+      'deathCount': deathCount,
+      'bossesDefeated': bossesDefeated,
+      'levelUps': levelUps,
+    };
+  }
+
+  /// JSON 역직렬화
+  factory SessionStatistics.fromJson(Map<String, dynamic> json) {
+    return SessionStatistics(
+      playTimeMs: json['playTimeMs'] as int? ?? 0,
+      monstersKilled: json['monstersKilled'] as int? ?? 0,
+      goldEarned: json['goldEarned'] as int? ?? 0,
+      goldSpent: json['goldSpent'] as int? ?? 0,
+      skillsUsed: json['skillsUsed'] as int? ?? 0,
+      criticalHits: json['criticalHits'] as int? ?? 0,
+      maxCriticalStreak: json['maxCriticalStreak'] as int? ?? 0,
+      currentCriticalStreak: 0, // 세션간 유지 안 함
+      totalDamageDealt: json['totalDamageDealt'] as int? ?? 0,
+      totalDamageTaken: json['totalDamageTaken'] as int? ?? 0,
+      potionsUsed: json['potionsUsed'] as int? ?? 0,
+      itemsSold: json['itemsSold'] as int? ?? 0,
+      questsCompleted: json['questsCompleted'] as int? ?? 0,
+      deathCount: json['deathCount'] as int? ?? 0,
+      bossesDefeated: json['bossesDefeated'] as int? ?? 0,
+      levelUps: json['levelUps'] as int? ?? 0,
+    );
+  }
+}
diff --git a/lib/src/core/model/task_info.dart b/lib/src/core/model/task_info.dart
index 089a2a6..dc5b936 100644
--- a/lib/src/core/model/task_info.dart
+++ b/lib/src/core/model/task_info.dart
@@ -1,4 +1,4 @@
-import 'package:asciineverdie/src/core/animation/monster_size.dart';
+import 'package:asciineverdie/src/shared/animation/monster_size.dart';
 import 'package:asciineverdie/src/core/model/monster_grade.dart';
 
 /// 태스크 타입 (원본 fTask.Caption 값들에 대응)