World War II shooter Red Orchestra 2 recent got an overhaul in the form of a GOTY Edition patch, bringing heaps of improvements to gameplay and performance.
Along with that went a free weekend and $10 sale. If you missed out but still want in on the game, you'll be happy to know the price has just been dropped to $20.
If you did already buy the game, however, you can now give out a guest pass to a friend. No limitations on this are detailed, so I can't be sure how long it lasts.
Hit up Steam to grab it, if you like.