Intrinsic rewards system

1. Player Challenges vs Game Challenges (Gamification Achievement Systems Tips)
2. Game Scenario vs Player Scenario (Gamification Player Progression Tips)
3. Social Gamification vs Individual Gamification (Player-Centric Gamification Tips)
4. Direct Competition vs Indirect Competition (Player-Centric Gamification Tips)
5. Achievement vs Progression (Player-Centric Gamification Tips)
6. Core Loop vs Game Loop (Player-Centric Gamification Tips)
7. Game Theory vs Gamification Theory (Player-Centric Gamification Tips)
8. Player Rewards vs Game Rewards (Gamification Achievement Systems Tips)