Carnage
A small, stair-filled arena. Due to the huge number of polys in view at any given time, this map is pretty slow on low-end machines... and it'll give you motion sickness on the back stairs on high-end ones. The upper pools hold goodies, but watch the lower ones... once you're in, you're in (until someone kills you).
Levels in map "∞ Carnage":
House of Carnage