The authors demonstrate how simulation games can be used to test and explore initial infrastructure designs before they are implemented. Games can provide important learning experiences for (future) designers and managers. The case study of a computer-supported simulation game, SIM Maasvlakte 2 (SIM MV2), uses a game whose object is to design and allocate land for the Maasvlakte 2 port area, to be built between 2006 and 2036 in the Port of Rotterdam, the Netherlands. The evaluation aimed at improving the game, examining the system complexity of the seaport, and establishing corresponding learning effects among the participants.