Square, and symmetrical in gameplay. Easy to get lost at first, but not too bad to learn. Two levels, with many ways between them... Nice central bridge area. Update tweaks textures and object placement.
A simple net level, probably best with two players. A couple of ledges are separated by a lava pit. One player can control the lava, and teleporters from one side to the other are at the bottom... just make sure your opponent's nowhere near the switch when you jump in.