Challenge balance

1. Game Performance vs Player Performance (Gamification Player Progression Tips)
2. Gameplay Difficulty vs Player Skill Level (Gamification Player Progression Tips)
3. Difficulty Curve vs Learning Curve (Player-Centric Gamification Tips)
4. Game Complexity vs Game Difficulty (Gamification Achievement Systems Tips)
5. Real-Time Multiplayer vs Turn-Based Multiplayer (Player-Centric Gamification Tips)
6. Flow State Vs. Immersion in Cognitive Gamification (Contrasts)