The readme says this is your basic arena level, but that's a bit misleading... there are three open areas, two of them island-pocked pools, and the third a ring-like room. (Which is actually two rooms, thanks to the magic of 5-D space...) All are connected by narrow passageways, with a few nice secrets. Look hard for the secret ammo room, and when you find it, make sure to check out your map view!