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Sega, for giving their flagship title to an inexperienced developer, changing the development platform and obviously setting an unholdable deadline and BRB, for not even fixing very obvious bugs. Sorry guys, but there is no excuse for a title like this. In any case that seems to be the contention in the video below from Unseen64 Liam, which cites former BRB employees stating that the project was originally in the works for other systems, and that the transition to Wii U was an issue due to the use of CryEngine 3.
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SEGA has messed up its share of projects when working with third-parties in the past, so it's certainly feasible. A lot of blame naturally falls on Big Red Button, which was producing its first game, though the studio may have been victim to mis-management from SEGA perhaps its Sonic's own house that is most to blame. It was a game with many problems, from the gameplay down to visuals that weren't in the same league as those of a teaser trailer that had built hype in the first place. Like any project it has its defenders, but many are agreed that it was a major disappointment, with Sonic Boom: Rise of Lyric on Wii U being the biggest culprit.
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Sonic Boom didn't do well on any metric its sales failed to match those of fellow Nintendo exclusive Sonic Lost World, and it was panned by many critics and Sonic fans alike.
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