6 levels, sort of a wide range. Some seem to be designed for solo practice (FAR too many aliens for a reasonable net game), while others seem to be designed for net play. Flow ranges from constrictive to pretty darn good. Most are quite large... but that's not such a big deal on the solo practice levels. Worth a look.

Levels in map "Quades":
My Guts Are Bigger Than Your Guts
Shoes and Shotguns
Critter Blankey
Water Works
The Sun