Personalized challenges

1. Achievement vs Progression (Player-Centric Gamification Tips)
2. Game Difficulty vs Challenge Difficulty (Gamification Player Progression Tips)
3. Game Achievements vs Player Achievements (Gamification Player Progression Tips)
4. Player Progression vs Player Development (Gamification Achievement Systems Tips)
5. Player Skills vs Player Cap (Gamification Achievement Systems Tips)
6. Game Completion vs Player Completion (Gamification Player Progression Tips)
7. Game Missions vs Player Tasks (Gamification Player Progression Tips)
8. Game Rewards vs Game Bonuses (Gamification Achievement Systems Tips)
9. Player Performance vs Player Scores (Gamification Player Progression Tips)
10. Player Identification vs Player Authentication (Gamification Achievement Systems Tips)
11. Player Feedback vs Game Feedback (Gamification Achievement Systems Tips)
12. Level Design vs Game Balance (Player-Centric Gamification Tips)
13. Player Competition vs Player Cooperation (Gamification Player Progression Tips)
14. Rewards vs Incentives (Player-Centric Gamification Tips)
15. Game Unlockables vs Game Achievements (Gamification Achievement Systems Tips)
16. Challenges vs Tasks (Gamification And Bloom's Taxonomy Tips)
17. Player Engagement vs Player Involvement (Gamification Achievement Systems Tips)
18. Skill Progression vs Level Progression (Gamification Achievement Systems Tips)