Free-to-play games

1. Free-to-Play vs Pay-to-Play (Player-Centric Gamification Tips)
2. In-App Purchases vs In-Game Purchases (Virtual Economy Gamification Tips)
3. Pay-to-Win vs Free-to-Play (Virtual Economy Gamification Tips)
4. Economic Environment vs Virtual Environment (Virtual Economy Gamification Tips)
5. Game Economy vs Virtual Economy (Player-Centric Gamification Tips)
6. In-Game Currency vs Premium Currency (Player-Centric Gamification Tips)
7. Leveling Up vs Ranking Up (Gamification Player Progression Tips)
8. Virtual Budget vs Game Budget (Virtual Economy Gamification Tips)
9. Virtual Resources vs Game Resources (Virtual Economy Gamification Tips)