Sonic the Hedgehog Cheats

Note: This code is for the Japanese version.
At the title screen, press C, C, Up, Down, Down, Down, Left, Right. You'll hear a ring sound. Pause the game when playing, and hold B to play in Slow Motion, press C to skip a frame, or press A to go back to the Title Screen.

At the title screen, press C,C,C,C,C,C,Up, Down, Left, Right. When the demo starts, hold A, B, C, Down then press Start. Instead of the Sonic Team logo, you will see a list of the game's developers in Japanese. When the title screen appears, a flashing "Press Start Button" will be there under Sonic's head.

This code is for the Japanese version. At the title screen, press Up, Down, Down, Down, Left, Right. You'll hear a ring sound. Hold A and Press Start for the level select.

Note: This code is for the Japanese version.
At the title screen, press Up, C, Down, C, Down, C, Down, C, Left, C, Right. You'll hear a ring sound. Start the game when holding A to be in Config mode that the Score and Time are distorted. Press B to enable Config mode, that Sonic morphs into a ring. Press A to switch through different items, Press C to place the sprite, hold A and press C to go backwards on selecting items, move around with the D-Pad, or Press B to morph back to Sonic.

When you ride the green block accross a sea of lave, there are a couple of big blocks in front of you with rings on. If you hold the D-PAD DOWN button, Sonic will crouch. The green block will go underneath the blocks, but sonic will remain on it, and pass through the walls. Note that this ONLY WORKS WHILE CROUCHING