Gameplay progression

1. Gameplay Difficulty vs Player Skill Level (Gamification Player Progression Tips)
2. Game Respawn vs Game Revive (Player-Centric Gamification Tips)
3. Gameplay Elements vs Game Features (Gamification Achievement Systems Tips)
4. In-Game Currency vs Premium Currency (Player-Centric Gamification Tips)
5. Virtual Budget vs Game Budget (Virtual Economy Gamification Tips)