A game for environmental urban management based on system dynamics models is being developed. Named ANARQUIA, this game uses Hypercard as a front end. ANARQUIA, considers a town managed without a government. The goal of the game, played by teams of five players operating under anarchist principles, is to manage the environment of a city optimizing environmental quality during the maximum amount of time. The game was applied to the town of Caparica, a traditional fishermen’s town in Portugal.