Circles inside of circles inside of circles inside of... Lots of staircases. A central (small) courtyard. Be sure to collect your weapons and ammo before going in... for some reason, the center doesn't seem to be big on the engine's random list. Nice looking, and very dangerous. Also available in an Evil flavor.

A simple 5D arena (or pair of arenas, to be more precise). The name comes from the orientations of the hills (which aren't actually hills, unfortunately).

A central arena with lots of twisty passageways and out-of-the-way sniper perches spread around. A nice feel to it, although some of the staircases are hard to see around.

A weaponless square ring, for two contestants to duke it out. If you leave aliens on, you'll have the added challenge of dodging fusion bolts from clueless bobs...