Player autonomy and choice

1. Game Rewards vs Real-World Rewards (Gamification Achievement Systems Tips)
2. Core Loop vs Game Loop (Player-Centric Gamification Tips)
3. Player Expectations vs Player Satisfaction (Gamification Achievement Systems Tips)
4. Session Metrics vs Engagement Metrics (Player-Centric Gamification Tips)
5. Voluntary Exchange vs Forced Exchange (Virtual Economy Gamification Tips)