Place over this file:
Steam\userdata\[userID]\584400\remote\SaveData.bin

This file replacement is ONLY needed if you have categories locked in the Main Menu
IF YOU CARE ABOUT YOUR REGULAR 'SONIC MANIA PLUS' DATA, BACKUP YOUR MAIN SAVE FILE AS THIS OVERWRITES IT, EFFECTIVELY DELETING IT

If on launch, Steam asks to use Cloud Data or Local Data, select Local Data.

