The project Urban-planning game represents a way of democratic involvement of the public in the shaping of the future of historic towns by way of an interactive game. It is based on cooperative behavior between the inhabitants, the experts and the government. The object of the game is acquiring ideas and guidelines for a lasting development on the basis of people’s needs and problems. As a possible way of communication I propose a publicly accessible cooperative nonzero-sum game on the playground of Geographic information system technology. The player has a free use of symbolic infrastructural elements. He can arrange them in the urban space according to his experience, needs and wishes and in agreement with his co-players. The end of the game is supposed to represent work and life in a modern town, organized according to the player’s plans.