If you let Sonic sit for three minutes without doing anything, he'll grow bored, say "I'm outa here!" and race off the screen, thus ending the game.

Press Up, Down, Down, Left, Right, Space at the title screen. Just like in the Sega version, you can choose any level, past, present, or future. However, if you warp or finish the level you will return to the title screen.

At the title screen, press Down, Down, Down, Left, Right, Space to call up a Sound Test menu. Special things will happen if you select the following sound combinations and press Start.

Sounds          Effect
PCM12, DA11     Debug Mode
PCM07, DA07     Play special stages
PCM03, DA01     Displays artwork
PCM12, DA25     Human-Faced Sonic w/ Japanese Message
PCM04, DA21     Hercules Sonic
PCM11, DA09     Revenge of the Mutant Artwork

Enter the Sound Test screen, and enter 7's in all the boxes. When you play that sound a secret stage will appear.

To view the designers high scores, press Right, Right, Up, Up, Down, Space at the title screen.