A pretty nice 5D map, in the vein of 5D space. A couple of secrets, but nothing you can't live without... (for example, there's a hidden spanker, but they'll show up in the main area after a little while). Good use of ambient sounds.
The outside arena is HUGE, and pretty slow on slower machines if there's anything in it... This is a model of the mapmaker's dorm. Some nice flow touches...