Optimal player engagement

1. Exchange Rate vs Conversion Rate (Virtual Economy Gamification Tips)
2. Player Engagement vs Player Motivation (Gamification And Bloom's Taxonomy Tips)
3. Player Training vs Player Education (Gamification Achievement Systems Tips)
4. Skill Levels vs Player Levels (Gamification Player Progression Tips)
5. Skill Progression vs Ability Progression (Gamification Player Progression Tips)