for sonic 1 enter this code AA UP DOWN LEFT RIGHT hold Y press start keep on hlding till level starts

for sonic 2and knux first at the tittle screen enter this code UP UP UP DOWN DOWN DOWN LEFT RIGHT LEFT RIGHT hold Y press start

u will go to level select go to sound test and enter this code 1,9,9,2,1,0,1,8 if u hear a ring chime after 8 choose a stage hold Y press start

keep on holding till level starts

for sonic3 and knux must have saved file go to angle island go on a swing thingy and enter this code LEFT LEFT LEFT RIGHT RIGHT RIGHT UP UP UP get a game over dont use any contenues now go to mushroom hill and go to a pully if using knux go to sonics way and do the same thing BUT

when u die hold Y while level starts