Bigger than it looks at first glance. Very dark (until you find the lights), and very light on ammo (until you find the secret areas).

Platforms acting as walls constantly change the shape of the playing field, providing differing paths for getting to your objective. Not much to look at, but can be fun to play.

A central building with some very confusing insides, and a few outer passageways. Hard to get used to.

10 levels, designed to be played solo (although not together). A bit linear at first... but good for a bit of carnage, if that's what you're looking for. No real plot on any of 'em.