Loosely based on the Mystic Base map from the Mystic Map Pak, this is a netmap with a twist... it can (sort of) be played solo. That is, there is a mission, of sorts, laid out by the terms.
A multilevel arena map, with tweaked physics. I'm not usually a fan of aliens in net games... but in this case, I'd make an exception. The hill is the entire arena floor, and the baddies generally stay down there.
A huge, organic-feeling map in which 8 people could play with breathing room. More aliens than you can shake a stick at... this one works fine as a solo stress reliever, as well.