Kill the wave. Take the money. Or don't.
One More Round is a co-op wave shooter built around a gambler's question. Every round you survive doubles a pot, and that pot only becomes yours the moment you walk away from the table. Die instead and the house keeps it.
Between rounds everyone lands in the same hub: a quartermaster selling guns, a firing range to sight them in, the house record on the wall, and a door. Through the door is two minutes of wave. Killing everything early is not enough to leave - the other players are in there with you.
Then the decision. Cash out with what you have, or go one more round for double. Everyone chooses for themselves, and nobody waits for anybody.
Four floors, each fought in a different venue, each worth more than the last. Spectate anyone on any floor while you are out.
Five guns, tuned to feel different rather than to sit on a damage curve: a snappy USP, a buzzsaw MP5, a shotgun that hits like a door closing, a controllable M4A1, and an M700 that takes its time. Fixed recoil patterns, so the spray is learnable.
Best with friends. Worse for your money.