Basically, we play this every now and then in our physical education class at my school, it's really fun and it's very easily translated to ace of spades.
It's basically a variation of dodgeball, but there is no teams. A bunch of players are randomly dropped into a map. It's FFA, but if someone killed you, you're teleported into some sort of spectator room, and you won't be able to play again until whoever killed you is shot dead. Which means that you will then be teleported back to the action. For someone to win, he has to kill everyone. These matches usually takes a lot of time to finish.
Also, if someone manages to get a nice killstreak of, say, 6 players, and he dies, all those 6 players will respawn again. Imagine two pro players killing absolutely everyone, and then they'll have to duel again. Whoever wins that duel, will now have to kill everyone that respawns again.
Also, giving someone who gets maybe 3 kills in a row a health replenish might be a good idea.
Either that or regenerating health.


Dungeon - phoenixlight
The cube - phoenixlight
Surviver - jdrew
The last one - Stopsignal
[please suggest more names!]
------------------------------
Also, whoever codes this, if any.
Thank you! and you can choose whatever name you want, of course.