Freemium games

1. Subscription Model vs Freemium Model (Player-Centric Gamification Tips)
2. Free-to-Play vs Pay-to-Play (Player-Centric Gamification Tips)
3. Subscription Model vs Freemium Model (Virtual Economy Gamification Tips)
4. Economic Impact vs Game Impact (Virtual Economy Gamification Tips)
5. In-Game Currency vs Premium Currency (Player-Centric Gamification Tips)
6. In-Game Purchases vs Microtransactions (Player-Centric Gamification Tips)
7. Player Economy vs Developer Economy (Virtual Economy Gamification Tips)
8. Economic Trends vs Game Trends (Virtual Economy Gamification Tips)
9. Game Economy vs Virtual Economy (Gamification Achievement Systems Tips)
10. Player Transactions vs In-Game Transactions (Virtual Economy Gamification Tips)
11. Premium Features vs Paid Features (Virtual Economy Gamification Tips)