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While the game primarily uses the main cast's modern character designs which debuted in Sonic Adventure, Dr. Eggman's character design in this game is unusually inconsistent. During most of his boss fights, his original design and outfit is used, but during the final boss fight and whenever he is seen outside of his vehicles, his appearance changes to his modern redesign.
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The Photo Pieces in Sonic the Hedgehog Pocket Adventure change based on region. Notably, the US version of the game uses "Dr. Robotnik" after the "Dr. Eggman" name had been established worldwide in Sonic Adventure, and - unlike games such as Sonic the Hedgehog 2, which use the reverse naming scheme - Tails is called Miles in the US and Tails in Japan.
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