Hidden content

1. Open World vs Closed World (Player-Centric Gamification Tips)
2. Replay Value vs End Game Content (Player-Centric Gamification Tips)
3. Game Levels vs Player Levels (Gamification Player Progression Tips)
4. Game Unlockables vs Game Achievements (Gamification Achievement Systems Tips)
5. Offline Games vs Online Games (Player-Centric Gamification Tips)