A tower, surrounded by a lava-filled moat. You can leave the tower to grab the big weapons, but the bridges are narrow... careful firing that spnkr, you might end up in the drink!

A simple 5D arena (or pair of arenas, to be more precise). The name comes from the orientations of the hills (which aren't actually hills, unfortunately).

Two levels. The bottom is a maze of twisty passageways, with a few hiding rooms. The top is a more open circle-and-cross based around a raised pool (but still tight).

Pillars, lava river, lots of ways to die. There are a couple of elevated rooms off the sides, with 2x rechargers in 'em... careful, 'cause they're guardable. (Also watch for a weird bug if you leave too fast... you can end up in a glass cage at the bottom of the stairs.)