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A pretty nice rendition of Waldo World. Outdoors, in (mostly) knee-high water.
A pit, filled with many pillars which can either act as cover or induce suicides, is surrounded by a ledge. The pillars effectively hinder sniping from the ledge... but the high ground is useful, nonetheless. (Watch for shots from below, though... the ledge is lit, and the pit is not.) Teleporters bring you up, jumping brings you down.