The document describes the development of a serious game to teach group decision-making skills to emergency managers. The game aims to embed learning in its mechanics by distributing crucial information among players, requiring cooperation. An evaluation found that groups playing the prototype made inefficient decisions and performed worse than individuals, replicating real-world group dynamics, suggesting the game provides a valid environment for skills training. Further work is needed to develop the full online multiplayer version and integrate it into the overall training program.