Big weapons are in the center, behind a wall you have to walk up to to open. (Don't get trapped inside-the only way out is to blast your way past someone else coming in.)

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 pretty incredible 26-level scenario from a Danish mapmaker. Quite a bit of new art, as well as art "borrowed" (with credit) from other work... The storyline is conveyed in chapter screens-the terms you find simply contain the secret terms from the original Marathon, in case you missed them the first time around. Some unpleasant tricks are here (save whenever you get the chance, since there are more than a few dead ends), and some silly stuff (pictures of naked women in the marine jail cells, the bobs are now boobs (and pretty well done, too), that sort of thing)

5 levels. Very large, generally quite playable. Lots of symmetry, as well as a bit of carelessness (bad textures in places you don't go very often, etc). A couple are very pretty to look at, and a couple seem to use textures gratuitously (that is, there are texture changes that seem to be nothing more than an attempt to get another texture in).