In KILLING FLOOR 2, players descend into continental Europe after it has been overrun by horrific, murderous clones called Zeds that were created by rogue elements of the Horzine Corporation. 6-player Co-Op & 12-player VS Zed-slaughtering mayhem.
Free for a Limited Time at Epic Games Store
https://www.epicgames.com/store/en-US/product/killing-floor-2/home
Source: Killing Floor 2