Desert Levels. Great textures (first water I've seen outside of the M2 preview), and enough baddies that these levels work equally well as solo (explore) levels and net (kill) levels. The patch affects different texture sets than Bob World Headquarters (see above), so they can both be applied to the same Shapes file. This is now Rev 1, with a few textures fixed.

Wow. This-wow. I'm amazed. Wow. This is the third floor of a science building... Wait, read the readme. I can't do it justice. Flying chairs, espresso machines, nitrogen canisters, this is a really, really well done package. Get it. 'Nuff said. (Okay, in the interest of objectivity, I'll say that if you don't have a PPC, this will be slow in net play. So what are you waiting for?

Lots of teleporters, some good sniping positions (and a decent crusher).

Big, and rambling. Works as a practice level.