Abstract
According to previous research, game development brings happiness to game creators, but the specific process of this has not yet been fully clarified. In this context, the present study conducted interviews focusing on the psychological process via game development based on the previous project and research conducted in advance by the presenters, and analyzed them using the modified grounded theory (M-GTA). As a result, a total of 12 concepts, one subcategory, and four categories were extracted, and a result diagram was formed. The story line suggested that “long-term hospital patients who experience the multidimensional power of games gain confidence and motivation through their first experience of creating and exhibiting games for external audiences, while receiving the power to move forward from medical professionals and other hospital patients”.