Sonic The Hedgehog, Level Select:
At the title screen, press Up, Down, Left, Right. Hold B to enter the Level Select screen.
Sonic The Hedgehog, Debug mode:
At the title screen, press Up, X, Down, X, Left, X, Right, Up, X, Down, X, Left, X, Right, X. Hold B and press Start, then while playing, press A.
Sonic The Hedgehog 2, Level Select:
At the Sound Test selection, select sounds 19, 65, 9 & 17. Hold X and press Start, then hold B and press Start at the Sonic/Tails screen.
Sonic The Hedgehog 2, Debug Mode:
First enable Level Select. Then, at the Sound Test selection, select sounds 1, 9, 9, 2, 1, 1, 2, 4. Select a level and hold B + Start until the game begins.
Sonic The Hedgehog 3, Level select:
Right after you hear SEGA but before Sonic appears, press Up, Up, Down, Down, Up, Up, Up, Up. Then press Up at the title screen.
Sonic The Hedgehog 3, Debug Mode:
First enable Level Select. Then hold B and press Start when selecting level.
Sonic The Hedgehog 3, Bonus level:
First enable Level Select. Then at the Sound Test selection, play sounds 1, 3, 5, 7. Hightlight Special Stage 2, hold B and press Start.
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