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Sonic Mania unlockables give you more incentive to replay than the average Sonic game, ranging from new moves based on …

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I listed the stuff Headcannon seemed to want to add to Sonic Origins' version of S3&K but couldn't, alongside the collection's bugs, oddities, inconsistencies between games and missing remaster content. : r/SonicTheHedgehog

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Sonic Mania Cheat Codes (Just like the Old Days) : r/NintendoSwitch

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Sonic Mania Cheats: Level Select Code, How to Collect Chaos Emeralds, Super Sonic, Special and Bonus Stages