Social sharing incentives

1. Game Design vs Game Mechanics (Gamification Achievement Systems Tips)
2. Game Difficulty vs Challenge Difficulty (Gamification Achievement Systems Tips)
3. Game Adventure vs Game Quest (Gamification Achievement Systems Tips)
4. Game Levels vs Player Levels (Gamification Player Progression Tips)
5. Player Levels vs Player Tiers (Gamification Achievement Systems Tips)
6. Game Progression vs Game Advancement (Gamification Player Progression Tips)