5 levels. No plot whatsoever-just kill everything you see. (You don't need to-the level teleporters work whether everything's dead or not.) Lots of crushers, lots of exploding bobs... took about 7 minutes on Normal to finish. (And that's because I was hunting for secrets.) Good for clearing the mind...

6 levels (5 plus a network level). Insane numbers of baddies, but generally a pretty nice layout. lots of ammo... and you can start on most levels, because the creator was nice enough to add extra weapons as you go along. If you're playing on a 68K machine, be careful in the big outdoor area in the vacuum level... you might want to use Ignore Zero Divides to avoid a crash from certain views

A single-level solo map. Your goal is to collect three repair chips... two are pretty easy, one's a bit tricky. A nice little 5-D area in the middle...

A big, rambling level that works better as a solo "kill everything" level than a net level. Lots of narrow passageways, and a bit light on the ammo...