Debug Mode for Sonic 1.

At the title screen, press [A] twice, then [Up], [Down], [Left] and [Right]. You should hear a ring chime. Hold down [Y] and press [Start]. Debug Mode is now active, as indicated by the score tally being made of letters and numbers. [Y] & [C] are still jump while [B] changes Sonic into an object which you can spawn by pressing the [C] button. Press [Y] to cycle through them and [B] to change back to normal. Be warned that over-using this will cause temporary slow-down and could cause problems.

 

 

 

 

Sonic The Hedgehog Level Select

At the title screen press up down left right. If done correctly you should hear a ring sound. Now hold Y and press start. You can now choose any stage you want.

 

 

 

Unlock Game Gear Games

 

 

 

 

Level select in Knuckles in Sonic 2

Press [up] [up] [down] [down] [left] [right] [left] [right], then hold [Y] and press [start].