The authors discuss and analyze the complex interplay between rail infrastructure development and land use development of railway station areas in the Netherlands. They argue that although this interrelation has been theorized and studied in the academic literature, the underlying complex and dynamic mechanisms, and the appropriate planning and management responses, are still insufficiently understood. This is particularly relevant for local, regional and national policymakers in the various subsystems, because a lack of network understanding and interconnectedness may produce suboptimal, unsustainable spatial and rail infrastructure planning. In order to better understand and manage the dynamic interrelations between rail infrastructure and urban development in the Delta Metropolis, the serious game SprintCity was developed. The game is played with the real stakeholders (administrators, planners, politicians, interest groups, experts and consultants, etc.). In this paper, the authors describe and analyze why and how the complexity of the real world system was modeled into a serious game.