As it is well known, the explicit representation of systems structure (e.g.: causal diagrams) is one of the main features of System Dynamics. In my view, this precious tool is perhaps being neglected or, more precisely, not utilised to the full when building and using models and games. In this way, the structure of the systems is hidden and the transparency of the models is lost. This can be especially negative in games which not allow the players to access the structure. That can leads to a decision making not based on the causes but on the symptoms, as standard black box games do.