Aux Battles is a free multiplayer music game: rooms, players, prompts, voting, all synced live across every connected browser. There's no game server behind it. Every client subscribes to Postgres changes through Supabase Realtime and reacts to a single phase column on the room row.
Source: [Dev.to](https://dev.to/emilism/building-a-multiplayer-game-with-no-game-server-postgres-realtime-as-the-state-machine-202b)