Killing Floor is a survival horror total conversion set in London, England. In a laboratory under the city, a series of human experiments in cloning and biological augmentation are being conducted by the employees of "Horizon". Horizon is a BioTech corporation formerly employed by the government to do the R&D on a top secret series of synthetic combat drugs which would enhance the effectiveness of soldiers in the field. Horizon's funding was cut, when their practices were deemed too immoral even for such a controversial project, but the research didn't stop. Funded by private money from the deep pockets of Horizon chairman and research scientist Kevin Clamely, tests continued in a more...private location. That was until something went wrong. There were reports that the lab had been comprimised; that the subjects were behaving abnormally...then, silence. Several days later, twisted shapes began to emerge from the confines of the lab into the city above.

Report abuse Killing Floor 2.52 [Zip archive]
Full Version
Dec 19th, 2011
294.04mb (308,325,869 bytes)
6,510 (2 today)
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Just a zip version as an alternative to our Windows Installer.

A community patched release. No need to download previous versions, this is a full release.

  • What's fixed: numerous bugs
  • New content: Boss wave/enemy (credit to Marco for giving us the private 2.51 patch content)
  • New splash screen :P


  • Extract this archive into your UT2004 folder.
  • After extracting, you should have the mod in your UT2004 directory, in a folder called "KFMod20".
  • To launch the mod go to UT2004/KFMod20/ directory, then start the "Killing Floor Mod.bat" file or the exe version (no difference, exe is for the nice icon if you want to make a shortcut somewhere).
  • Note to Linux users: to start UT2004 mods you need to start UT2004 with the "-mod=Modname" command line switch. In KF's case: use "UT2004 -mod=KFMod20". Just make an .sh script, I forgot to make one :(


  • UT2004 full and latest version (v3369)
  • Editor's Choice Edition (ECE) content. Download UT2004 Megapack - it's ECE + v3369 patch combo

For KF/UT2004 related help and community, visit

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Killing Floor 2.52 [Zip archive]
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CorporalHicks Dec 20 2011, 10:11am says:

Thanks for this!

+2 votes     reply to comment
Rajliv Dec 21 2011, 5:48pm replied:

you're welcome

+2 votes     reply to comment
jackyvinh Jun 11 2012, 9:47am says:

full version ?

+2 votes     reply to comment
FiredFox3 Aug 18 2012, 4:06pm replied:


+2 votes     reply to comment
mitchelllakey1 Nov 4 2012, 5:50pm says:

what type of mod is this?

+1 vote     reply to comment
neomax17 Jan 31 2013, 4:10am says:

It can crash when attach UT2004 v1.0 ???

+1 vote     reply to comment
Rajliv Apr 2 2013, 12:55pm replied:

yes, you need up to date UT2004.

+1 vote     reply to comment
Guest Apr 27 2013, 8:59pm says:

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zoober Aug 29 2013, 6:09am says:

Is this mod MP only?

+1 vote     reply to comment
Guest Nov 21 2013, 9:53am says:

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de_philipp Nov 21 2013, 7:02pm says:

Yeah. I playedd it today with steam on linux the first time. Now I download the mod version for the next lan party. Yeeha.

+1 vote     reply to comment
Guest Mar 8 2014, 10:37pm says:

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Release Date
Released Aug 13, 2007
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