Hidden Songs:
To get more than the 39 default songs in sound test mode, successfully complete The Moon Zone, Extra mode, or unlock the Super Sonic Ending. Three additional songs will be available.
Unlockable: Moon Zone:
Beat the game with all four characters and collect the seven Chaos Emeralds. Then, beat the final zone with Sonic. After you defeat Robotnik, Sonic will go to the Moon Zone as Super Sonic.
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