Sega Genesis.. Mega Drive
Genesis is the US name for the console and MegaDrive the Euro name..
Sonic the Hedgehog

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
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On the Title screen, press:
Up, Down, Left, Right.
You will hear a sound to confirm.
Hold A + Start to begin game play.

Enable the Level select cheat. Select the "Bonus level" option on the level selection screen. Obtain the Chaos Emerald, reset the game, and repeat the process until all of them are in your possession. Allow the game to continue after obtaining the last Chaos Emerald to start in the Green Hill Zone.

This code may only be enabled on the first version of the game.
On the Title Screen, press:
Up, C, Down, C, Left, C, Right, C, Start, then hold A.
Continue to hold A until game play begins.
Screen coordinates will appear instead of a score and the number of objects displayed will appear instead of the time remaining.
Use one of the following controller actions to enable the corresponding debug code.
Object transformation
Press B during game play to change Sonic into a game object. Press A to change into a new object. Press C to place an object on the screen. Press B again to revert back to Sonic. Note: The type of object that may be selectable will vary from level to level.
Sonic is, by default, invincible in debug mode.
Slow motion
Pause game play and hold B.
Pause game play and press A.
Frame advance
Pause game play and press C.

Submitted by: Aziz K

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*Please note: In the US and some other regions this system is known as the Sega Genesis. In other regions, including Japan and Europe, the console is known as the Sega Mega Drive.