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LEVEL SELECT AND SOUNDTEST
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Quickly press UP, UP, DOWN, DOWN, UP, UP, UP, UP, after the Sega logo fades and
Sonic starts to appear, and before the screen flashes white. A chime will
confirm correct code entry. Press UP at the title screen to access level select
and sound test options.

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DEBUG MODE
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Enable the "Level Select" code. Hold B, then press START when selecting the
desired level.

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SECRET LEVEL
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Enable the "Level Select" code and select the sound test option. Play sounds
1, 3, 5, 7 in that order. Highlight "Special Stage 2", then hold B and press
START.