Tripwire Interactive LLC is an American video game developer based in Roswell, Georgia, formed by members of the international team that created Unreal Tournament 2004 mod Red Orchestra Combined Arms. Red Orchestra won top prize in the Nvidia-sponsored Make Something Unreal competition. Their first retail product, Red Orchestra Ostfront 41-45, was released over Valve Corporation's Steam service, They are also a licensee of Epic's Unreal Engine 3. Tripwire released their third game, Red Orchestra 2 Heroes of Stalingrad, which is the sequel to their debut Red Orchestra Ostfront 41-45. The game is a World War II-themed first-person shooter. The title focuses heavily on the Battle of Stalingrad.