A two level arena...Carnage should be high. Don't look at the ceiling-it's a bit weird. (While you're trying to figure out why it bothers you, you'll get a grenade in your back...)

A big central waterfilled room, with passages off it in various directions and at various heights. Because the main room is waterfilled, there isn't much sniping to do... most firefights seem to happen in the side passages (and there aren't really enough exits...)

A little loop of a map, with a great mineshaft as one arm. Great place for ambushes! Update adds quite a bit to the mines... lots of places to hide, lots of stuff to find.

A very cool little arena which is more than it looks, due to some funky 5D stuff. Great flow, and it'll keep your group busy, even if you're small (we had fun with just two).