The initial maze is annoying (texture choice makes it really hard to see where you're going), but there's lots more to find.
Simple torus. Comes in two flavors-net play (watch the inside room) and solo play (lots and lots and lots of exploding bobs).
Five more from the CarnageMeister. 4 originals, one modified Bungie level (Bob-B-Q). I don't know... There's still plenty of carnage, but more and more finesse is required... Maybe he's just getting older. (Nahhh...)