A tiny geometric level, with interesting lighting. Weapons and ammo seem to be designed for two or three players, but there are 8 starting positions. If you decide to run through this solo, you won't see any of the items-they've all been designated network-only.

Based on the original Arena in M1, but with much wider hallways. (And an extra secret or two...)

For anyone who's seen a previous incarnation of this map (it is available in both M1 and M2 flavors), this version is a serious upgrade. It feels more like a small city block, instead of a single room (well, a pair), and there is support for 8 players, finally. For those who haven't seen this map before, check it out. This is 5D space taken to the extreme. Two nearly identical areas (differing only in textures) occupying the same space, with windows for attacking, and a convoluted passageway to actually cross over. Spectacular...

The infinity level, ported to the M2 alien textures. It's no longer vacuum, and all the baddies are gone... but so are some of the windows (which makes for easy transfer from hallway to hallway, actually).