Side quests

1. Game Sequel vs Game Expansion (Player-Centric Gamification Tips)
2. PvP (Player vs Player) vs PvE (Player vs Environment) (Player-Centric Gamification Tips)
3. Leveling Up vs Ranking Up (Gamification Player Progression Tips)
4. Game Unlockables vs Game Achievements (Gamification Achievement Systems Tips)
5. Player Stages vs Game Stages (Gamification Player Progression Tips)
6. Game Pace vs Game Flow (Player-Centric Gamification Tips)
7. Achievements vs Trophies (Player-Centric Gamification Tips)
8. Player Levels vs Player Tiers (Gamification Achievement Systems Tips)
9. Player Motivation vs Player Satisfaction (Gamification Achievement Systems Tips)
10. Player Skills vs Player Abilities (Gamification Player Progression Tips)