What will the architectural ‘style’ of the Metaverse be? Drawing inspiration from building mechanisms in popular ‘creative’ videogames such as Fortnite, Post-City explores how the component-based collage approach to building that these games promote could produce a resurgence of Postmodern architectural principles in the Metaverse. The building systems of Fortnite could be seen as an influential piece of design software, especially among its most populous player base, 18-22 year olds. Post-City seeks to engage these young people with architecture by using a game-based mechanism they will be familiar with, placing it in an architectural design context. By analysing visual techniques and details from notable Postmodern buildings, Post-City invites players to experiment with architectural design in a Fornite-inspired environment, with user constructions judged on how closely they align with postmodern design principles. With millions of young people already highly familiar with such building systems, Post-City questions how such interfaces might become more and more integrated into design tools and what this might mean for future architects of the Metaverse.