In the 21st century, urban space will be the central organizational form of society. The construction, renewal and operation of the necessary infrastructure go hand in hand with significant burdens for the natural environment. Achieving the objectives of Agenda 2030 and the Paris Agreement will call for the active involvement of the relevant players. Simulation games provide an opportunity for this in that potential development paths can be tested and experienced in a playful manner and verified in terms of their feasibility. The aim of this project is to develop a simulation game based on databases and models, and to build on these in order to identify and evaluate potential development paths towards a post-fossil city. In particular, their impacts on social metabolism should be rendered visible and conflicts between the involved players in the game should be revealed.