Sega Mega Collection
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Sonic 2 Debug Mode
First go to the Sonic 2 Sound Test screen and play sounds 01, 09, 09, 02, 01, 01, 02, 04. Now at the sound test screen hold B and pick a level and Start.
Sonic 2 - Be Super Sonic
After you've done the Pick Level code/cheat go to the Sound test screen and play sounds 04, 01, 02, 06. Now collect 50 rings and jump to be Super Sonic.
Sonic 1 Pick Level & Sound Test
First go to the Sonic 1 title screen and press Up, Down, Left, Right. Now hold B to pick a level & get sound test.
Sonic 2 Pick Level
First go to the Sonic 2 Sound Test screen and play sounds 19, 65, 09, 17. Now hold X and press START. Now on the title screen hold B and press START.
Sonic 3 - Debug Mode
Go to the Stage Select screen and hold button B. Then pick a level and start.
Sonic 1 Debug Mode
First go to the Sonic 1 title screen and press Up, X, Down, X, Left, X, Right, Up, X, Down, X, Left, X, Right, X. Now HOLD B and press Start. Now when the game starts press A to go to debug mode.
Sonic 3 - Get Extra Stage
After doing the Pick Level code/cheat, go to the Sound test screen and play sounds 01, 03, 05, 07. Now highlight Special Stage 2 and hold B and press START.
Sonic 3 - Pick Level
As you hear Sega spoken but BEFORE the main menu appears press: Up, Up, Down, Up, Up, Up. Then at the title screen press Up to get Stage select and Sound Test.