How to Design Personalized Challenges for Mobile Motivational Systems? Ask Your Players!

Gamification techniques have proven to be effective in inducing positive changes in the user’s behavior. However, their difficulty has to be carefully calibrated to avoid both frustration and boredom. We present a novel algorithm for automatic challenge generation, calibrated from players’ opinions and evaluated in the context of a large-scale and long-running sustainability urban mobility game. The results suggest that our methodology was effective in increasing player participation and performance.