It turns out that Sonic Mania Plus has even more hidden things in store, with cheat codes that are usable through the level select menu by playing certain tracks using the sound test. [Thanks, Sonic ...
Once you get all the medals from the Bonus Stages, you'll unlock Blue Spheres in the Extras menu, where you can play all 51 Blue Sphere Stages. When you enter Press Garden Act 1, look for the first ...
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