Difficulty level adjustments

1. Game Respawn vs Game Revive (Player-Centric Gamification Tips)
2. Offline Games vs Online Games (Player-Centric Gamification Tips)
3. Player Engagement vs Player Involvement (Gamification Player Progression Tips)
4. Skill-Based Progression vs Level-Based Progression (Gamification Player Progression Tips)
5. Game Environment vs Game World (Gamification Achievement Systems Tips)
6. Sandbox Games vs Linear Games (Player-Centric Gamification Tips)
7. Player Experience vs Player Competence (Gamification Player Progression Tips)
8. Skill Progression vs Ability Progression (Gamification Player Progression Tips)