So say there are 12 gates around the perimeter of the city, which is underground, so the gates are carved into the wall. The gates lead to tunnels that form an intricate underground cave system, where they fight to the death. I think we would skip a few so it would be about 1 year into the program when the rp started, this way there could already be groups formed and such. Think Battle Royale/hunger games but they get 2 week breaks from the arena, and spend 1 week in the arena.