Unlockable content rewards

1. Game Objectives vs Player Objectives (Gamification Player Progression Tips)
2. Game Balance vs Fair Play (Gamification Achievement Systems Tips)
3. Gameplay Achievements vs Social Achievements (Gamification Achievement Systems Tips)
4. Game Success vs Player Success (Gamification Player Progression Tips)
5. Game Achievements vs Player Achievements (Gamification Player Progression Tips)
6. Game Advancement vs Player Advancement (Gamification Player Progression Tips)
7. Game Quest vs Learning Quest (Gamification-Based Learning Tips)
8. Player Motivation vs Player Engagement (Gamification Player Progression Tips)
9. Replay Value vs End Game Content (Player-Centric Gamification Tips)