Game balancing

1. Achievement vs Progression (Player-Centric Gamification Tips)
2. Game Difficulty vs Challenge Difficulty (Gamification Achievement Systems Tips)
3. Game Success vs Player Success (Gamification Player Progression Tips)
4. Multiplayer vs Single-player (Gamification And Bloom's Taxonomy Tips)
5. Player Expectations vs Player Satisfaction (Gamification Player Progression Tips)
6. Player Metrics vs Game Metrics (Gamification Achievement Systems Tips)
7. Virtual Goods vs Digital Goods (Virtual Economy Gamification Tips)