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view Game Genie Codes
A Level Made Of Glitches
Platform: Genesis
To use this code, you must have the Level Select Code on. Then, hold A on the controller, and pick a 2-Player Level. Then, during gameplay, hold A. Pause the game, and press A to get out of it immediately. Then, choose a Special Stage. 

Hit a Red Sphere in the Special Stage. Then, you will notice graphical glitches in the level. Sonic will look bigger, too, and there will be limited lives. 

The level will just basically act like a normal 1-Player level, when it really is a 2-Player one, instead.

Another (Harder) Level Select code
Platform: Genesis
First, you must have a Sonic 2 cartridge. Take it and enter Sonic 2 level select, which are sounds 19, 65, 09, 17, return to title screen, hold A+START. Once in Sonic 2 Level Select, hold A, remove the cartridge with the Genesis on, Insert Sonic 3, and press Reset. Now, release A and press Down twice at main menu.
Change Identities
Platform: Genesis
Enter Debug mode, start a level that has a special stage ring, choose a sprite of your choice, enter the ring as that sprite and hit B twice, as soon as you leave that zone, you'll be that sprite for the rest of the level.
Debug Mode
Platform: Genesis
Enter the level select code, then press A + START and choose your level. Once the action starts, press C to create an item, B to toggle between items, and A to select items.
Different Battle Music
Platform: Genesis
Just before you fight Robotnik in the Hydrocity Zone, act 2, the boss music will come. Keep Sonic's head under the shallow water until he is about to drown, then pop out of the water. You will hear the boss music from Sonic and Knuckles.
Extra Rings
Platform: Genesis
(Note: Be sure to have both Sonic AND Tails on-screen) Enter debug mode, turn into the ring sprite. Next, just keep pasting rings onto Tails.
Level Select
Platform: Genesis
Switch on the machine, and when the SEGA logo appears and Sonic jumps forward, quickly press:
UP, UP, DOWN, DOWN, UP, UP, UP, UP, UP. If you've done it right, you'll hear a ring sound. It's VERY difficult to get working, so keep resetting and trying again if it won't work. If it does work, on the title screen, highlight "1 PLAYER" and press UP, a new option called SOUND TEST appears. Press start to enter it and select which level you want to play from.
SuperSonic
Platform: Genesis
Press START to play, or press A+START to play with SuperSonic- You'll notice the score is scrambled. Collect 50 rings and double jump for SuperSonic.
The Real Supersonic
Platform: Genesis
Go to stage four and collect 50 or more rings. Press A, B, and C at the same time. The music will change. You will be a golden Yellow and twice as fast. You can jump twice as high too. I would collect 70 rings if I were you. Once you use this code, every 1 or 2 seconds makes you lose a ring. When you lose all of your rings or beat the boss to go to Act 2, you will become normal again.
View Animations
Platform: Genesis
Enter debug mode and press B+C. Then Sonic and Tails will show-off their moves!