Premium currency

1. Premium Currency vs Free Currency (Virtual Economy Gamification Tips)
2. In-Game Currency vs Premium Currency (Player-Centric Gamification Tips)
3. Gameplay Elements vs Game Features (Gamification Achievement Systems Tips)
4. Virtual Property vs Physical Property (Virtual Economy Gamification Tips)
5. Game Respawn vs Game Revive (Player-Centric Gamification Tips)
6. Game Wealth vs Virtual Wealth (Virtual Economy Gamification Tips)
7. Virtual Budget vs Game Budget (Virtual Economy Gamification Tips)
8. Game Economy vs Virtual Economy (Gamification Achievement Systems Tips)
9. Leveling Up vs Ranking Up (Gamification Player Progression Tips)
10. Player Rewards vs Player Achievements (Gamification Player Progression Tips)
11. Player Transactions vs In-Game Transactions (Virtual Economy Gamification Tips)