A really quick hack in response to a Usenet post asking about faking sidways doors in M2...

A two level arena...Carnage should be high. Don't look at the ceiling-it's a bit weird. (While you're trying to figure out why it bothers you, you'll get a grenade in your back...)

A big central waterfilled room, with passages off it in various directions and at various heights. Because the main room is waterfilled, there isn't much sniping to do... most firefights seem to happen in the side passages (and there aren't really enough exits...)

A little loop of a map, with a great mineshaft as one arm. Great place for ambushes! Update adds quite a bit to the mines... lots of places to hide, lots of stuff to find.

A very cool little arena which is more than it looks, due to some funky 5D stuff. Great flow, and it'll keep your group busy, even if you're small (we had fun with just two).

A slick little arena. Very slow on 040 machines, but pretty nonetheless. Sort of a glorified Thunderdome (okay, very glorified). Watch the lava...

Well, you might have to wait until Infinity comes out for an in situ editor, or one that can handle sprites, but this nifty little tool should help immensely in the meantime. It allows you to extract wall textures from M2 Shapes files, and save them in M1 format. You can then edit them with any of the Marathon 1 Shapes editors, and then reinsert them. I only did preliminary testing, and there are quite a few restrictions (read the docs), but it seems to do exactly what it say it'll do. Texture editors, go at it!

Thunderdome with a large pool in the center. I'm not sure if it still has a hill... The arrows in the side rooms are fun.

Very dark arena, with a sniper ledge running around the top edge. Very nice flow-there are multiple ways to get to most spots.