Sonic & Knuckles [Model G-4124]

* Debug mode and all Emeralds (Locked-On to Sonic 2):
First activate and go to the Stage Select. Play the tracks in Sound Test with button B in this order: 01 09 09 04 01 00 01 08.
This enables the Debug code, you should hear a ring chime if the code is entered correctly. start the selected level with A+start.
To get all 7 Chaos Emeralds, input this code the same way: 01 06 07 07 07 02 01 06
You should hear the Emerald chime. Note: this code may not work without the Debug code

* Level Select:
Start a game and go to Angel Island Zone Act 1. Go to one of the swings that you hang from and grab on. While Sonic is swinging, press Left, Left, Left, Right, Right, Right, Up, Up, Up. You will hear a ring if you entered the code correctly. Pause the game and press A to take you back to the title screen. Press Down twice to find the newly unlocked Sound Test menu. Enter it, where you can play all of the sounds/music in the game and warp to any level.

* Debug mode (Locked-On to Sonic 3):
While playing Sonic 3 and Knuckles press Left(x3), Right(x3), Up(x3) in the mushroom hill zone, while on one of the pully things. (Just like level select in normal Sonic and Knuckles).

* Bonus game trick:
Put a game other than Sonic 2 or 3 in the top of the Sonic & Knuckles cartridge. Then, when it shows the picture of the trio and the message at the top, press A, B, and C simultaneously to play Bonus Games.

* GAME GENIE CODES (SONIC & KNUCKLES GAME ALONE):
AFKT-AAG0: Start with 1 life instead of 3
AKKT-AAG0: Start with 2 lives
AVKT-AAG0: Start with 4 lives
AZKT-AAG0: Start with 5 lives
A7KT-AAG0: Start with 7 lives
BFKT-AAG0: Start with 9 lives
DFKT-AAG0: Start with 25 lives
GKKT-AAG0: Start with 50 lives
NPKT-AAG0: Start with 99 lives
K2WA-CA4J: Infinite lives