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In-universe in KH3D, for the Mark of Mastery, Yen Sid sends Sora and Riku to the Sleeping Worlds - living dreams - with the intention that they start over from scratch and redevelop their skills. As a result, while in the Sleeping Worlds, Sora and Riku revert to the bodies they had at the beginning of their original journey in KH1.

Out-of-universe, KH3D was the tenth anniversary title. Sora returns to his original design as part of the celebration.

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