Killing Floor is a cooperative zombie, horror, survival FPS by Tripwire Interactive for PC.
Set in London, England, the Horzine Biotech, a biotechnology company, conducts military experiments involving mass cloning and genetic manipulation. During the process things go very badly and the human subjects begin to exhibit horrific mutations, disfigurement, becoming hostile, and eventually overrun the internal security forces. They escape and begin overrunning the city of London.
Where do I begin? Killing Floor has the most realistic weapons of any game I have ever played and I am a gun owner. The gameplay never gets boring no matter how much you play. This isn't a simple zombie survival by any means, oh no.
"So how did Killing Floor become so successful you ask? It's a really good question but simple to answer, this game is possibly one of the most clever games ever created due to the fact it's not one of the games where you try to get the other side of the level and re-stock on supplies then trying to get to the other side of that level or trying to gather supplies and making gangs and being a total ♥♥♥♥♥♥♥ ruining other people's experience with that game." - scud[i]Ö!
The zombie hordes will ensure death and believe me--they will. Each wave becomes harder than before until meeting the final boss, the Patriarch. In between each wave you can visit the Trader's location which changes with every wave. Players earn money for every kill and for surviving the wave. Use the money to buy: katanas, shotguns, flamethrowers, and more. Select perks at the start of each match for bonuses.
Killing Floor is deliciously fun and shouldn't be missed.