In-game rewards system

1. Player Identification vs Player Authentication (Gamification Achievement Systems Tips)
2. Player Data vs Game Data (Gamification Achievement Systems Tips)
3. Difficulty Curve vs Learning Curve (Player-Centric Gamification Tips)
4. Player Metrics vs Game Metrics (Gamification Achievement Systems Tips)
5. Real-Time Multiplayer vs Turn-Based Multiplayer (Player-Centric Gamification Tips)
6. Player Stats vs Player Profile (Player-Centric Gamification Tips)
7. Player Skills vs Player Abilities (Gamification Achievement Systems Tips)
8. Player Challenges vs Player Objectives (Gamification Player Progression Tips)
9. Item Rarity vs Item Value (Virtual Economy Gamification Tips)
10. Virtual Items vs In-Game Items (Gamification Achievement Systems Tips)
11. Game Economy vs Virtual Economy (Player-Centric Gamification Tips)
12. Game Difficulty vs Challenge Difficulty (Gamification Player Progression Tips)
13. Gaming Community vs Gaming Culture (Player-Centric Gamification Tips)
14. Game Sequel vs Game Expansion (Player-Centric Gamification Tips)
15. Social Features vs Multiplayer Features (Player-Centric Gamification Tips)
16. Player Engagement vs Player Retention (Player-Centric Gamification Tips)
17. Game Completion vs Player Completion (Gamification Player Progression Tips)
18. Economic Trends vs Game Trends (Virtual Economy Gamification Tips)
19. Quests vs Missions (Gamification Player Progression Tips)
20. Casual Games vs Hardcore Games (Player-Centric Gamification Tips)
21. Session Metrics vs Engagement Metrics (Player-Centric Gamification Tips)
22. Skill-Based Progression vs Level-Based Progression (Gamification Player Progression Tips)
23. Achievements vs Trophies (Player-Centric Gamification Tips)