If you fancy having a go at Tripwire’s realistic World War 2 multiplayer shooter, you can do so: Red Orchestra 2 is free on Steam for 24 hours.
So long as you head over to the Steam page and download it before the promotion ends – which is at 10am PST on 24 April – then it’s yours. Forever and ever.
I haven’t played Red Orchestra 2 in quite some time, but I thoroughly enjoyed it back when it first launched, and from what I can gather it’s still a very active game. As such, you might as well head on over and pick it up. I mean, why not? It’s free.