Enable level select
While turning on the Game Gear, hold UP. Watch the screen - as Knuckles picks up the third emerald press START. But beware starting too late in the game as you might not get all the chaos emeralds you need to finish the game.
Contributed By: CSeddon.
Time attack and Sound Test
When the Sega logo appears, press UP or DOWN.
Contributed By: Captain Doormat.
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