Use game mechanics effectively

1. Learning Curve vs Difficulty Curve (Gamification Player Progression Tips)
2. Player-Centric Design vs User-Centric Design (Player-Centric Gamification Tips)
3. Player Progression vs Player Ranking (Player-Centric Gamification Tips)
4. Player Ratings vs Player Rankings (Gamification Player Progression Tips)
5. Player Status vs Player Reputation (Gamification Player Progression Tips)