"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.
The series' focal point, graphic depiction of human bodily dismemberment, makes another appearance in Soldier of Fortune II. GHOUL 2.0, as the new engine was called, features 36 gore zones, allowing for increasingly detailed depictions of gore and carnage.
In contrast with the first game, Soldier of Fortune II has a more diverse number of real-life weapons. Several of the weapons can have special attachments such as a laser sight. In the single player campaign, it is also possible to have mixed akimbo weapons.
Unlike the original game, there are no futuristic weapons or sci-fi elements. The most advanced weapon encountered is the OICW, which is based on a former weapon prototype of the United States military."
Source: Wikipedia, "Soldier_of_Fortune_II:_Double_Helix," available under the CC-BY-SA License.