All of the claims you may have heard that Crysis could only run on nuclear-powered supermachines were greatly exaggerated. But if for some reason you worry that this stand-alone companion to the ultragorgeous first-person shooter will bring your PC to its knees, you should know that it's highly scalable and ran smoothly on a number of machines during our testing. It also looks better, with clear attention given to the game's artistic sensibilities and the lusher, denser environments. But rest assured, developer Crytek has enhanced more than just the graphics engine. Vehicles are more fun to drive, firefights are more intense and focused, and aliens do more than just float around you. More emphasis on the open-ended environments would have been welcome, but a more exciting (though shorter) campaign, a new multiplayer mode, and a whole bunch of new maps make Crysis Warhead an excellent expansion to one of last year's best shooters.