Sound Effect codes:
Select the Sound FX option and play the following sound sequences to activate the corresponding cheats:
SOUND SEQUENCE – CHEAT FUNCTION
00, 05, 01, 03, 07, 00 – 25% speed
00, 04, 02, 09, 06, 04 – 50% speed
00, 04, 02, 05, 05, 07 – Sped up Music
00, 09, 00, 01, 06, 08 – Free movement (Pause the game and press 1 2)
00, 02, 01, 01, 06, 06 – Huge Sprites
00, 01, 01, 07, 07, 03 – Reset Mode (Pause the game and press 1 2)
00, 05, 02, 08, 07, 00 – Reset to title screen
00, 02, 02, 00, 06, 09 – Invert colors
00, 09, 01, 02, 05, 04 – Invert colors, sped up music
01, 01, 01, 01, 04, 09 – Scene: 1st Bonus Stage
01, 01, 01, 01, 04, 03 – Scene: And there comes Sonic and Tails…
01, 01, 01, 01, 04, 08 – Scene: Bonus Screen
01, 01, 01, 01, 04, 04 – Scene: Sonic, go ahead!!
01, 01, 01, 01, 04, 01 – Scene: Title Screen
01, 01, 01, 01, 04, 07 – Scene: Toxic Tools Boss
01, 01, 01, 01, 04, 05 – Scene: Toxic Tools Screen
01, 01, 01, 01, 04, 06 – Scene: Toxic Tools Stage
01, 01, 01, 01, 04, 02 – Scene: Veg-O-Fortress rising
00, 05, 00, 03, 06, 00 – Show year and version
00, 02, 01, 05, 06, 06 – Stage Skip (Press DOWN to skip stages on pause screen)
00, 03, 01, 01, 05, 05 – Start with 9 lives
00, 03, 01, 09, 06, 08 – Strong gravity
00, 08, 00, 07, 07, 01 – Strong inverted gravity
01, 01, 01, 02, 05, 00 – Weak gravity
00, 08, 02, 07, 06, 06 – Weakest gravity
Multi-Ball Stage:
To unlock the Multi-Ball stage, get all the rings on a level. Then find the gate which looks like a large sparkling ring.
Hidden Emerald:
At the third level, go to the cells. Hit the middle cell. An emerald will drop. Go to the bottom to find a hidden emerald.