A very large arena (author recommends 6 players). A little disorienting, but lots of open space.
A nice arena, inspired by Thunderdome (the M1 level, not Bungie's).
6 levels. Newest level is vacuum. Some interesting touches. Best for folks who have mastered vertical aiming. Nice staircase in Double Helix.
15 levels in two maps. A real grab bag. Some very nice maps, some almost novelty maps. Level 3 of the second set (Come See the Fights) is PowerMac-Only.