Six to fifteen seats, a sheriff's badge, and no judge but the server.
Pick the table size when you open it β the standard 6 to 15 ladder, with the guard swapped in for the hunter wherever the board allows either. Then hold up the QR code inside the room: everyone scans and lands in a seat, password and all. There is no matchmaking queue, because a queue that needs six strangers at the same minute is a button that fails.