Sonic Mania Plus Announced - Siliconera

In Summer 2018, Sonic Mania Plus will be released. It will add Mighty and Ray as playable characters, as well as 4-player multiplayer and an Encore Mode.

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Sonic Mania Plus launches July 17 in the Americas and Europe - Gematsu

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Sonic Mania Plus first developer diary: 'Art and Design' - Gematsu

Sonic Mania Plus announced - Gematsu