Arena type with four bases and peopled (peopled?) with every assortment of alien to come down the pike. This is a fine map, supports up to 8, probably better with 4-6. Also supports solo play. Good Deal here.

Green is the sewage pool in center. Raised ledges, ammo rooms, but, if you get shoved into the sewage, no damage. Dude! You can walk on water! Fast play, round & round.

Up, down, around, and around. And around. Lots of staircases, lots of tight passageways, but plenty of open space, as well. The textures could use a little work (the Evil version seems a bit cleaner, overall), but mostly it's a great place to blow people up. Plenty of troopers, if you wanna play it solo.

A very precise polygon with raised crosswalks connecting sides, not all that much ammo, didn't see any recharger. One catch, those drones again. They tend to snap hidden doors shut just when your aim is sure. Damn! This could be a really good ride if you like arena-type maps with a few tricks thrown in.