Quest completion rewards

1. Game Levels vs Player Levels (Gamification Player Progression Tips)
2. Gameplay Evolution vs Player Evolution (Gamification Player Progression Tips)
3. Game Respawn vs Game Revive (Player-Centric Gamification Tips)
4. Game Difficulty vs Challenge Difficulty (Gamification Achievement Systems Tips)
5. Player Interaction vs Player Activity (Gamification Player Progression Tips)