Fight Club
RR: unfinished
I'm going to have to see this one in action - after its first release, the map was withdrawn to sort out some sort of problem, but the idea always has been that two players can have a fairly brutal one-on-one here, with other NAB people watching from safely outside the killing ground.
          So, it sounds like a nice idea, so CurtSquirt should have a popular arena here.  Version two added spikes and mounds that were triggered by buttons outside the fighting arena... but Curt has not yet finished with his ideas here!