As promised, Steam News announces that Killing Floor 2 is now playable for free, and anyone can check out the early access shooter between now and Sunday at 4:00 pm EDT. Here's word on the game:

Killing Floor 2 is the successor to the ridiculously fun and successful original title, that was released in 2009. We released Killing Floor 2 on Steam via Early Access in April 2015 and over the last 7 months have rolled out 3 massive content updates as we get closer and closer to the final release.