Culture Arcade questions the future of cultural institutions in the face of emerging technologies for the exhibition and marketisation of art. Exploring the Southbank Centre as a paradigm of a cultural institution, the game generates a procedural museum that emphasises the collective fungibility of artistic practice rather than the artificial scarcity of NFTs. Exploring a generative environment based on Brutalist architecture, players create their own artistic interventions and reshape the virtual world by sharing them. Employing skills from an artistic toolbox, players collaborate to extend and augment the cultural institution in their own image. Participants can paint and sculpt the architecture around them, procedurally generate or carve space at their command, warp architectural features or even turn the space into a giant dynamic environment that pulses to player-generated music. Culture Arcade allows players to produce new cultural platforms for the Metaverse by leveraging the aesthetics of games to increase engagement with cultural practice, creating an urbanism co-designed through cues from real-world architecture, algorithmic generation, curation and collaborative design.