The co-op zombie-slaughtering FPS Killing Floor 2 first appeared on Steam in April 2015 in Early Access. Now, after several updates including new weapons, perks and maps, developers Tripwire will be releasing the full complete game on November 18th 2016. On the same day, Killing floor 2 will be releasing on the PlayStation 4.
After owning the game since its release, I still believe that the developers will need to add more content in order to justify the $29.99 price tag. However, the game is reasonably bug-free and can be very enjoyable with friends. Hopefully, Tripwire can add all the missing content before its full release and sort out some balancing issues. Once these features are updated, I would strongly recommend giving this game a try.