Tripwire Interactive is offering Red Orchestra 2 free on Steam for the next 24 hours, with access to the World War II shooter being permanent for all who take advantage during the promotion. Word is: "Today, Tripwire Interactive is pleased to announce a special fan promotion in which users can download Red Orchestra 2, PC Gamer's 2011 First-Person Shooter Game of the Year (Multiplayer) on Steam free of charge for a 24 hour period! And, so long as you install it during that 24 hour period, it is free to keep. Permanently!"