Welcome to the FX codes
 
Blue codes are old, they can be found everywhere or in a few places.
 
Red codes I've found in mags and sites but I can't get them to work. (they are probably fake)
 
Green codes- I don't have this game so I can't test it.
 
Orange codes are discovered by me, you might find them elsewhere but they were here first.
Select a system
MASTER SYSTEM
Sonic 1
Debug Mode - At title screen press Left, Right, Down, A + Start (Hold A + Start until game starts)