Sonic CD

Allow Sonic to sit for three minutes without doing anything. He will grow bored, say "I'm outa here!" and race off the screen, thus ending the game.

Enable the "Sound test mode" code. Set the options to PM12 and DA11. If done correctly you should see a picture of Tails, and a sign that says "See you next game". Hold B and choose "Play Game". To change into a object, press A. To turn into your normal self, press A again. Note: If you try to do this in time attack mode, you will go through objects, meaning you cannot jump on anything (springs, robots, spikes). Also, in a original game you cannot put down a object that you turn into.

Enable the "Sound test mode" code. Set the options to FM40, PCM12, DA11 and press Start. A screen with Tails will appear. Begin game play, and press B to change into an object, A to select another object, or C to place the object on the screen. While debug mode is enabled, the completion time for each level will be "0:00".

There is a debug mode, but for this to work you'll have to get in the sound test area. In the sound test, put those numbers to their appropriate mode: FM40 PCM12 DA11. When those numbers are in place, hit the start button. If this sequence is set correctly, you should have a pic of Tails, a Jeep and a word from the Staff saying ''See You Next Game.'' Push any button and you shall go back to the main menu screen. Start any game and you will be in debug mode.

Hit the B Button and Sonic will transform into any object/enemy you want to place on the zone. Press C to change the object, and press B to go back into Sonic. The changes however will disappear after you've completed or exit the act.

Enter these numbers at the sound test:FM no.46, PCM no. 12, DA no. 25 then press start. A Japanese message with creepy sonic should appear.

Press Up, Down(2), Left, Right, B at the title screen while "Press Start" is blinking. A sound will confirm correct code entry. Note: Only one level may be played if this code is enabled.

You can play your own audio CDs while you play the game. To do this, pause game play and eject the game disc from the Sega CD tray. Replace the game disc with an audio CD. When you close the cover, wait about four seconds for the console to start the CD spinning. When you resume the game, you will hear the music from the audio CD. If you complete a zone or lose all of your lives, re-insert the game disc and it will pick up where it left off. You can also use this trick with CD-Rs.

Press Right(2), Up(2), Down, C at the title screen.

You must first beat the game in Time Attack Mode in under 37'27''57. Then return to the title screen to find a new option open: D.A. Garden

In the sound test menu, put 07, 07, 07 in all sound modes, and then press Start. A message like ''WELCOME TO THE SECRET SPECIAL STAGE'' shall appear. Complete this and you'll get something special in return.

To see the best times of the game designers, at the title screen press Right, Right, Up, Up, Down, and C.