Reviewers praised certain elements, such as the sense of speed in daylight stages and the graphics and audio that make up the environments, but criticized others, such as the Werehog game mechanic, as well as several gameplay and design concepts. While it was commercially successful, selling 2.45 million units, critical reception was mixed.

Public anticipation for Sonic Unleashed was high, as video game journalists saw it as a possible return to Sonic's platforming roots. Three versions of the game were developed: one by Sonic Team for the Xbox 360 and PlayStation 3, one by Sonic Team and Dimps for the Wii and PlayStation 2, and one by Gameloft for mobile phones. The game's existence was first brought to light when Sega trademarked the Unleashed name in March 2008, and shortly after, images and a gameplay video were leaked. The Werehog gameplay was conceived to help introduce newer gamers unfamiliar with the Sonic franchise to the series. It was initially conceived as a sequel to Sonic Adventure 2 (2001), but developer Sonic Team began to introduce enough new innovations that separated it from previous games, and it was renamed Unleashed. The game's development began in 2006 and lasted 18 months, after the creation of its game engine, the Hedgehog Engine. Night-time levels see Sonic transform into the Werehog gameplay slows down to accommodate greater platform play, and involves combat against waves of enemies using the Werehog's brute strength. Daytime stages incorporate Sonic's traditional platforming and trademark speed, with a combination of behind-the-back third-person viewpoints and 2D side-scroller platforming gameplay seamlessly transitions between these two views. Gameplay features two distinct styles, with each being played either during daytime or nighttime. The story follows Sonic as he attempts to restore the world after his nemesis Doctor Eggman shatters it with a powerful laser to unleash Dark Gaia, an ancient evil, while dealing with having become a 'Werehog', a werewolf-like transformation, which he gains after coming into contact with the energy of Dark Gaia. Sonic Unleashed is a 2008 platform video game in the Sonic the Hedgehog series. Fixing the switch opens the path ahead, leading to a crazy bobsled course.Platformer, action-adventure, beat 'em up Air dash through it, boost through the robots, and end up at a broken switch and moon medal. The 2D section is real short and after the first gap, the second is safe to fall down.Д«ack in 3D, there's a hidden path on the left that comes up quick. Once running over ice be careful as to not slip off to a sloppy death. Speed boost through the large chunk of snow by the first group of enemies for a sun medal then continue boosting through the second group and over the water. The second sun medal is in the next area, up and behind the Gaia Gate. Also grab the sun medal to the right of the switch before continuing on. Start by stomping the busted switch down to open the door ahead. Sonic can dash across the water during the day to reach spiked boots that allow him to stomp. Break the snowman for a moon medal, and another rests behind the two igloos behind Jari-Thure. Head down the hill and run into a familiar face. Head out to Halooska when ready to continue the story. Ridding people of spirits involves fights that need to be finished within a time limit. Returning grants use of the camera! Now that you can exorcise spirits, now would be a good time to travel back to Apatos and Mazuri. Use them to cross and land into one last fight before the key fragment reveals itself. There's a sun medal behind the planters here, and a few new flying baddies appear. Used the ledge at the top to cross to the next side where grabbing the flying foes leads to a safe descent. Climb up to the clock face and sidle across the hands before it's too late. After releasing there's little time to waste as the hand slowly resets itself. Turn the lever outside to move the clock's hour hand to run straight with the minutes.

There's an easy to reach soundtrack and when Sonic reaches the extra life, there are two cogs leading up to another sun medal, and a quick swing to the tower's exit. The third checkpoint in this tower starts with some posts and poles. Right after the second check point though there's a column that Sonic can latch onto, climb, and use two posts to reach a sun medal.

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