A very nice large arena, with a fast-moving peripheral ring. Two rechargers in the center, but if your opponents are any good, you won't be able to use them. In solo mode, the aliens give you a nice run for your money... troopers and hunters regenerate at absurd rates, but enforcers and fighters are on your side to help out. (Careful, though... there are enough enforcers that friendly fire is a real hazard.) Attractive design, and great flow.