*Sega Genesis and Sega Megadrive Game Cheats
Sonic and Knuckles
Alt. name(s): Sonic & Knuckles

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LEVEL SELECT
Insert the Sonic The Hedgehog 2 cartridge into the Sonic And Knuckles cartridge.
On the Title Screen, press:
Up, Up, Up, Down, Down, Down, Left, Right, Left, Right.
You will hear a sound to confirm.
Press A + Start to display the level selection screen. This code will also all rings to be kept if your character is hit.

UNLOCK BONUS ROUNDS
Insert any non-Sonic Genesis cartridge into the Sonic And Knuckles cartridge.
Hold A + B + C and press Start when the "No Way" message is displayed.

UNLOCK THE DEBUG MODE
This code may only be enabled on the first version of the game.
Insert the Sonic The Hedgehog 2 cartridge into the Sonic And Knuckles cartridge. Play songs 1, 9, 9, 4, 1, 0, 1, 8 in order at the level selection screen. Then, select any level, hold A, and press Start. 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.
Invincibility
Sonic is, by default, invincible in debug mode.
Slow motion
Pause game play and hold B.
Restart
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.