Sonic the Hedgehog is heading out on an adventure like never before. Powered by an all-new engine, Sonic Unleashed combines classic Sonic thrills with the latest in next-generation technologies. Dr. Eggman has unleashed a slumbering beast from the center of the world, causing a seismic tremor that splinters the world into seven continents. Even more shockingly, this event causes a hair-raising change in Sonic himself, altering him with phenomenal new powers and abilities that come out when the sun sets. Help Sonic race to save the world ~ and himself ~ as he deals with his amazing transformations.Highly detailed 3D environments combine with furious 2D action in Sonic Unleashed. The compelling story finds Sonic maintaining his high-speed skills throughout the day, but at night he becomes a mysterious, dark form with never-before-seen powers. From 3D-action brawling to amazing agility, the heroic hedgehog will have a host of new tricks in his arsenal. Explore up to nine areas that resemble such real-life locations as the Great Wall of China, Arctic Pole glaciers and much more. Next-gen capabilities, including global illumination, grid computing, continuous data streaming and an intricate path finding system, treat you to Sonic gameplay that will excite you every step of the way.