Sonic CD -- Sega CD
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Sound Test and more-
At the title screen, press DOWN, DOWN,
DOWN, LEFT, RIGHT, A. Also, if you set the FM, the PCM and the DA
to the appropriate numbers and then press START you can access
some cool surprises. These are:
FM 07  PCM 07  DA 07- Secret bonus stage.
FM 46  PCM 12  DA 25- Strange Japanese message.
FM 42  PCM  04  DA 21- Strange humanoid Sonic picture. Reminds me
of Batman.
FM 44  PCM 11  DA 09- Manga Sonic.
FM 42  PCM 03  DA 01- MC Sonic picture.
FM 40  PCM 12  DA 11- Debug Mode. If it works, youÕll see Tails
standing with a Jeep. Start a new game and during it, press B to
toggle debug on or off, then press A to cycle through the various
objects, and press C to place them.

Title Screen Trick-
At the title screen, hold A and press
UP, DOWN, DOWN, DOWN, DOWN, UP. You'll hear a chime. Then use
controller 2 to manipulate the clouds. LEFT zooms out. RIGHT
zooms in. UP and DOWN tilt the horizon. A and C rotates the
clouds and B speeds them up.

Time Attack Rewards-
If you clear the time attack under
certain qualifying times, the game lets you do some pretty cool
things. This trick only works if you've previously beaten the
game. The qualifying total times are:
37'27"57- A new "D.A. Garden" menu selection appears at the title
screen. Select this, and you can manipulate a picture of the
Little Planet. The control pad moves the planet, B rotates the
planet, C zooms in or out, and A let's you choose music. START
exits.
30'21"05- Press left at the Time Attack screen and you can play
the Bonus Rounds with no time limit. START exits the round.
25'46"12- A new "Visual Mode" menu item will appear. This lets
you view all the cartoons as well as a hidden pencil test.

Stage Select-
At the title screen, press UP, DOWN, DOWN,
LEFT, RIGHT, B to access a stage select menu.