In-game surveys

1. Game Rules vs Game Instructions (Gamification And Bloom's Taxonomy Tips)
2. Player Engagement vs Player Retention (Player-Centric Gamification Tips)
3. Free-to-Play vs Pay-to-Play (Player-Centric Gamification Tips)
4. Game Completion vs Player Completion (Gamification Player Progression Tips)
5. Game Design vs Game Mechanics (Gamification Achievement Systems Tips)
6. User Generated Content vs Developer Generated Content (Player-Centric Gamification Tips)