At the Sonic CD title screen, press Down, Down, Down, Left, Right, A to go to the sound test.
Setting all three Sound Test selections to 07 will load this stage that features the enlarged head of Eggman as its background and has a rather difficult layout. It's possible that an extra Time Stone was to be collected here at one point, though it's probably just a little bonus thrown in for curious players, much like the hidden pictures.
Completing this Special Stage will display a secret credits screen.
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