How many times have you felt guilty when someone talks about the grand crises in the world: water, energy, food, poverty? You assiduously recycle your bottles, cans and paper, but have a nagging feeling you should be doing something more. Don’t beat yourself up. It’s hard to help when you don’t understand the exact nature of the problem. Now there’s a way: games. Or to be more accurate, serious games. Yes, it sounds like an oxymoron but serious games are becoming the most popular tool to engage citizens to collaborate and solve world challenges.