It's about getting into that house and not going out again. You have become prey for ungodly creatures, test subjectives. This is the final version of KF-Constriction which is also whitelisted.
KF-Constriction is my first Killing Floor map, yet well received it is about surviving in a medium sized manor partly reminiscent of the one in Resident Evil 1. While not super-original, Constriction managed to get some own distinct style by usage of layout circles and distinct lighting. Also, there are very few camping positions, the gameplay revolves around circling, to great effect. This was made as a learning map for the new editor, so only retail content has been used if I recall correctly.
This version is whitelisted which means you can level your perks on this map.