Encourage player engagement

1. Barter System vs Trading System (Virtual Economy Gamification Tips)
2. Game Update vs Game Patch (Player-Centric Gamification Tips)
3. Player Ranking vs Player Rating (Gamification Achievement Systems Tips)
4. Competitive Play vs Cooperative Play (Gamification Achievement Systems Tips)
5. Game Narrative vs Game Mechanics (Player-Centric Gamification Tips)
6. Game Scores vs Player Scores (Gamification Player Progression Tips)
7. Player Feedback vs Player Progress (Gamification Player Progression Tips)
8. Player Growth vs Player Mastery (Gamification Player Progression Tips)
9. PvP (Player vs Player) vs PvE (Player vs Environment) (Player-Centric Gamification Tips)
10. Skill Levels vs Player Levels (Gamification Player Progression Tips)