Processing Plant

A 1994 map with some of the limitations you might expect, but overall this is well thought out and executed. It's also a very good challenge, certainly on the UV setting. It's actually for E1M1, as another review points out.

 

There's a Doom 2 conversion of this on the Demon Gate CD compilation, and maybe others.

 

A bit better than the bare 4 stars. Around 8.5+ out of 10.

This is from May 1994. It's pretty good - simple, in a real old fashioned E1 style, but with more monsters and action than an E1 level. It's mostly a dungeon, with some slime. There's a nice wall of imps at the end. A couple of bugs, both in the "lava lab" - there's a cacodemon that doesn't come out, so you can't get 100% kills, and the lava isn't actually poisonous (although there are rad suits). The readme says this is E2M6, but it's actually E1M1.