Soldier of Fortune II: Double Helix is a video game created by Raven Software a sequel to Soldier of Fortune. It was developed using the Quake III: Team Arena engine. Once again Raven hired John Mullins to act as a consultant on the game. Based on comments and criticisms of the original game Raven Software developed Soldier of Fortune II to be a more "realistic" game with tactical shooters like Operation Flashpoint: Cold War Crisis and Tom Clancy's Rainbow Six as inspirations rather than Quake. A sequel titled Soldier of Fortune: Payback made by Cauldron HQ was released for Microsoft Windows PlayStation 3 and Xbox 360 in 2007.