UAC Ultra
About
You're a Space marine...
Disease. An incurable though tangible threat. The demons prowl among the scorched barrens of Mars. Fleets of cacodemons infest every region. Spectres and imps swarming from every crevice. Deep down under Mars' subterra lies UAC's immense labyrinth of superhuman technology. The underground top secret lair of their most horrific experiments, buried in distress.
This is UAC Ultra.
An 11 (and a half) map levelset for Doom 2 featuring all new textures, a new monster, new music and several other small touches. Difficulty will hopefully keep you on your feet without being ridiculous.
The texture set is available as ultratex.wad
v1.2 fixes bugs on all maps. Plus it works with Eternity. Thanks esselfortium and Doomworld!