Sonic Unleashed was delisted from retailers in 2010, following Sega's decision to remove all Sonic games with below-average Metacritic scores from sale. Many felt Unleashed was not the game to reinvigorate the series. 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, initial 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 high definition consoles such as the Xbox 360 and PlayStation 3, one by Sonic Team and Dimps for standard definition consoles such as 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 and is what influenced the use of Unleashed as a subtitle for western markets. 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 Sonic World Adventure in domestic markets. 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. Platformer, action-adventure, beat 'em up

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