eCity is a serious game developed by the ADLES consortium in a previous project based on the engine of a city-development simulator. eCITY provides a game-based approach for PBL and already includes a set
A set of problems are already available but teachers can create new scenarios for their students based on the game context, for instance to reflect real situations in the partners cities.

You can download the game here: http://ecity-project.eu/en/game/