This is a Killing Floor 2.52 map that is "borrowed" from the original AS-CaveOfTrials map by CrazyFrag.
It is revised by yours truly to enable Killing Floor 2.52 gameplay. It is originally an AS (assault) map. I just took a small section of it and used it for the UT2004 mod. The map consists of caves or hallways that are filled with traps or challenges (like acid water and heights) that the player have to go through. But basically a Killing Floor zombies after you game.
As usual, unzip the files to the KFMod20 directory. And please, read this important message - Dottie33.freewebpages.org.