M'Netta Operation 2.5
This puppy's BIG. Also dark, with winding, twisting passages, and many many levels on top of each other. And bright, with open, airy areas with nice views. (Did I mention it was big?) Don't bother using your map... it's nearly useless. Engrossing, but watch the traps-you'll have to start from your last save if you get caught... Update fixes a few things that are funny, adds baddies, aligns textures... It's also not bright anymore. (It's at night.)
Levels in map "The M'Netta operation v2.5":
Electric Lady