Urban dRain is a serious game developed to bring public and private actors together to co-develop a stormwater management plan whilst resolving any potentially conflicting views. In the game, participants are challenged to develop a stormwater management strategy in multiple rounds, first within their own separate groups, and then collectively. Participants can combine grey infrastructure measures like sewer upgrades with sustainable urban drainage solutions (SUDS) such as green roofs, permeable pavements, and rain barrels and get feedback on the performance of their strategy using an underlying Excel tool. This dataset contains supplementary materials about the game sessions and the results, and the Excel-based tool for the game.