This really snuck under the radar for us, but yes there is currently a free weekend going on for killing floor 2, a horde mode, co-op shooter, for up to 6 players.
So if you have never played it before, you should definetly try it now, its only 5 gb to download and you and your friends can get endless coop fun out of it.
More Stories
Suicide Squad: Kill The Justice League Overview : Everything you need to know
God of War Ragnarok: The Realms at War Walkthrough
God of War Ragnarok: The Summoning Walkthrough