A small, donut-shaped arena with a series of stairs around the outside, and some notches on the inside. Too small to stop moving for long...
A small, tall room with stairs around the outside, a couple of protected rooms with big weapons (and teleporters as the only entrance), and sniper pillars. Vertical distance is big enough that you actually have to aim.
A small, very simple, high-carnage map consisting of a bunch of intersecting hallways. 5D space without the 5D-there's no place to hide.
Modeled after a western town, complete with jail, saloon, bordello, mines, and Boot Hill! A bit linear, but that comes from trying to set it up around Main Street (as most old west towns were), and there are usually multiple ways out of a room.
A big, rambling level. There's some of everything-the author says he was experimenting. Could use some variation in lighting...