Having been broken apart by the evil Dr. Eggman, it's up to Sonic to put the pieces of the world back together again by retrieving the power of the chaos emeralds! In doing so, Sonic finds himself in a race against time and faced with an unusual situation that challenge hims in ways never before seen. Both day and night play different, yet important, roles in Sonic's newest quest... as the sun sets, a new adventure awakens. By completing a wide variety of action-packed stages, spanning the seven broken continents of the world, gamers unleash Sonic’s amazing abilities to save the world, and himself! In addition to running at high speeds, which is highlighted in four new speed mechanics, combat fighting now becomes possible. New combat, movement, functional abilities and platforming are introduced to offer increased depth and variety. Sonic Unleashed offers a re-defined experience for fans and newcomers of the franchise alike by combing picturesque & detailed scenery, an expansive world with multiple paths to choose from and dynamic viewpoints for an immersive and renewed gaming atmosphere. Along with seamless 3D to classic 2D camera transitions, the game is built on a powerful, new proprietary "Hedgehog Engine," which introduces impressive lighting abilities and new technology tailor made for Sonic’s new speed capabilities.