Enter Level Select code (19,b,65,b9,b,17, then a+start at title. Then enter the debug code( 1,b,9,b,9,b,2,b,1,b,1,b,2,b,4,b) now sonic can change into many different things and duplicate them(be to change from sonic to object & again to change back, a to cycle through objects, and c to duplicate them.
If you use the super sonic code + the debug code together, you must hold a until the zone title, sonic and tails or not with tails appear for the super sonic code to work.