A small diamond-and cross configuration, with a pit in the center. Stay out of the pit. Textures will make your eyes hurt after a while.
Actual level title is much, much longer. (Check the readme.) Very dark, with crushers everywhere... and no way out of the pit.
A two player map. Each player is in an enclosed space, facing the other across a no-mans land. Death rates will be low, unless your opponent doesn't know how to take cover.
A long, dark rectangle with a lava pit in the middle.