Making the city healthier, takes good cooperation by different domains. Besides the experts on city planning and health, we need to listen to the residents of the city, the schools, private parties, health and welfare organisations, and youth and sports clubs. In order to practice for this difficult task we designed the serious Game called ‘In2Action’. All the mentioned stakeholders are brought together so they can collaborate with each other to fiend solutions for the problems that arise when working on a healthier city. The game takes place in the fictional municipality of Struinen, but generates knowledge that’s is very usable in the real world.