Soldier of Fortune II: Double Helix is a first-person shooter video game developed by Raven Software, the sequel to Soldier of Fortune. It was developed using the id Tech 3 engine as opposed to the original's id Tech 2, and published in 2002. Once again, Raven hired John Mullins to act as a consultant on the game. Based on criticisms of the original game, Raven Software developed Soldier of Fortune II to be a more "realistic" game, with more modern tactical shooters like Operation Flashpoint: Cold War Crisis (2001) and Tom Clancy's Rainbow Six (1998) serving as inspirations, rather than Quake (1996). Like the first game in the series, Double Helix pushed the boundaries of depictions of gore and violence, and is considered more graphic and realistic than most in the first-person genre. This time around, the theme was germ warfare rather than nuclear weapons plotting. The multiplayer mode had five different gametypes, and playing through the single-player story, a player could choose from four different levels of difficulty. An unrelated sequel titled Soldier of Fortune: Payback, made by Cauldron HQ, was released for Microsoft Windows, PlayStation 3 and Xbox 360 in 2007. Story The theme of the Double Helix is germ warfare, as the mercenary Mullins and his new partner Madeline Taylor travel to Colombia to investigate a viral outbreak in a small town, only to link it to a shadowy organization called Prometheus. The virus, called Romulus, is followed by a computer virus called Remus which is programmed to delete files on any computer in the world, in this case, files relating to Prometheus and Romulus, so an anti-virus cannot be formulated. Prometheus then plans to blackmail the G8 countries at a summit in Switzerland for billions of dollars. It is revealed throughout the course of the game that a mole inside The Shop may be feeding information to the terrorists. Gameplay Soldier of Fortune II is a shooter game played from the first-person perspective. In the campaign, the player must complete a series of levels that encompass Soldier of Fortune II'''s storyline, reprising their role as special operative John Mullins from the first installment. Its campaign can be experienced through four levels of difficulty: Amateur, Gun for Hire, Consultant, and Soldier of Fortune. Alternatively, players can select the Random Missions Generator to create levels with unique parameters. Following the gameplay formula of its predecessor, Soldier of Fortune