killing floor 2 is a first-person shooter video game developed and published by tripwire interactive, with later support from saber interactive. it is a sequel to 2009's "killing floor". an early access version of the game was released for microsoft windows in april 2015, and the game was released in november 2016 for windows and playstation 4 and august 2017 for xbox one. the game utilizes epic games' unreal engine 3.