The only game in town for PC users wanting to build maps. A few glitches, still, but all in all, a nice program. (I haven't used it, really, beyond opening it and seeing what sort of features it has... but I've done a bit of work cleaning up maps made with it, so I know about the glitches firsthand.) Shareware, $10.

A space station with one large central room, and several outlying areas. Nice views from the hallways... and the staircase in the central room adds to the flow dynamics. (Not quite as effectively as it could, since the switch to raise and lower it is on the bottom level-if it were on top, you could trap people in the hole.) Big enough, and spread out enough, that two players might get bored.

Bungie's Duality, modified with Bobs that shoot grenades or lava globs. The idea is to give people without access to a network the challenge of a net game. (SPN stands for Single Player Network.) Works okay, except that bobs will never shoot like real people... and not much care was taken with the physics model. (Although the shots are right, the sounds aren't... sort of strange when you hear pistol shots,and turn around to see lava globs coming at you.)

A small square arena with a pit surrounded by a ledge, four pillars, and four rooms. Vacubobs and devlins will duke it out in the pit... you can watch, or you can jump in for the nuke guns.