A pretty cool small level designed for two players. You face each other across a lava moat. Both have a large wall to hide behind, but your opponent can raise yours with a well-placed projectile, leaving you defenseless... and for those who believe the best defense is a good offense, you can build a bridge across the moat (although it's not necessary-you can simply run across, using the alcoves on the side).

An arena level with a large pool in the center. Half of the bottom rises and falls slowly, making a good high spot (or missile block). Teleporters speed up end-to-end travel, and light switches control who's visible and who isn't...