Surprise and Delight

1. Player Progression vs Player Development (Gamification Achievement Systems Tips)
2. Game Difficulty vs Challenge Difficulty (Gamification Player Progression Tips)
3. Player Levels vs Player Tiers (Gamification Achievement Systems Tips)
4. Digital Assets vs Game Assets (Gamification Achievement Systems Tips)
5. Player Expectations vs Player Satisfaction (Gamification Player Progression Tips)
6. Points vs Badges (Player-Centric Gamification Tips)