Virtual rewards system

1. Subscription Model vs Freemium Model (Virtual Economy Gamification Tips)
2. Game Achievements vs Player Achievements (Gamification Player Progression Tips)
3. Game Revenue vs Virtual Revenue (Virtual Economy Gamification Tips)
4. Skill Levels vs Player Levels (Gamification Player Progression Tips)
5. Tradable vs Sellable (Virtual Economy Gamification Tips)
6. Player Stages vs Game Stages (Gamification Player Progression Tips)
7. Real-Time Multiplayer vs Turn-Based Multiplayer (Player-Centric Gamification Tips)
8. Monetization Strategy vs Revenue Model (Virtual Economy Gamification Tips)