This paper utilizes a modular generative design framework, as proposed by Azadi & Nourian (2021b), to create a serious game that includes a novel phase - the development phase - in addition to the three phases proposed in the original framework: planning, configuration, and shaping. The serious game incorporates both digital and physical elements and is tested through a case study involving the transformation of the Kruispunt church in Voorschoten. The game deals with the different stakeholders, their goals and relation towards the church, but also with the values related to attributes that come with religious architectural heritage. In a role game five students play the role of the participants. The reached consensus within the serious game can directly be applied on the case study but the idea is they will be also interpreted by an architect in the last phase, the shaping or as this paper proposes the implementation phase. This paper recommends future research can be done on the further development of a serious game using scoring mechanism, AI and stakeholder participation instead of roleplay.