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The game's existence was first brought to light when Sega trademarked the Unleashed name, and shortly after, images and a gameplay video were leaked to the public in March 2008. Public anticipation for the game was high, owing to the video's demonstration of some two-dimensional gameplay, seen as a possible return to Sonic's platforming roots. However, critical reception for the game was mixed, with reviewers praising certain elements, such as the sense of speed in daylight stages and the graphics and audio that make up the environments, and criticizing others, such as the new Werehog game mechanic, as well as several gameplay and design concepts. Many reviewers felt that Unleashed was ultimately not the title that would be able to reinvigorate the series.[11][12][13][14] Sonic Unleashed was de-listed in 2010, following Sega's decision to remove all Sonic titles with average Metacritic scores from sale in stores.[15] Despite this, the game was made available to purchase on PlayStation Network on April 8, 2014.