The games for health field links many actors with many complementary roles. In an ideal world, all the stakeholders participate to each Participatory Design loop and all continue to participate meaningfully as the design is specified, implemented, delivered, installed, and used. In this paper we argue that before a successful Participatory Design session can take place all the stakeholders need to construct a common Culture of Participation. In order to construct this shared Culture of Participation we propose to use games (in place of Participatory Design sessions) to reach a sufficient level of shared understanding that will allow to improve rehabilitation methods and treatments.