Tripwire Interactive has announced that you can get Red Orchestra 2: Heroes of Stalingrad for free on Steam until April 24th at 10:00AM PST. 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! "