"Sonic the Hedgehog is on an adventure unlike any other! Powered by an all-new engine, Sonic Unleashed merges classic Sonic gameplay with the latest in next-generation innovation. Merging blistering 2D action with meticulously rendered 3D environments, players race through intriguing locations across the globe as Sonic to save a chaotic world. On a quest for domination once more, Dr. Eggman unleashes a slumbering beast from the center of the world. The event causes a devastating tremor that splinters the world into seven continents and triggers a hair-raising transformation in Sonic. With the world divided and Sonic altered with new abilities and powers, the stage is set for a climactic battle. For when the sun sets, a whole new adventure awakens!"
- Sonic's World Transformed: Sonic maintains his high-speed abilities during the day, but at night he is transformed into a mysterious dark form with incredible never-before-seen abilities including 3D-action brawling and amazing agility.
- Tight Navigation and Speed Control: Players accelerate to super speed with 'Sonic Boost' by collecting rings to increase Sonic's 'Ring Energy.'
- Powerful New Engine and Cinematic Graphics: With its new proprietary “Hedgehog Engine,” Sonic Unleashed enhances the classic 2D perspective with mind-blowing 3D stages.
- Enhanced and Expanded Environments: Many unique and fascinating continents offer the player an opportunity to save the world in a dynamic, high-speed experience.
- Sonic the Hedgehog returns in this platform for Xbox 360 with 2D and 3D elements
- Different style of gameplay depending on whether it is day or night
- Nine beautiful levels based on real-life locations