stage select
Go to the sound test at the options. Play this accordingly,19,65,9,17.
Hear that chime again? Go back to the tittle screen and hold A and press start.
Instant super sonic
Go to the sound test at the stage select. Play this accordingly,4,1,2,6. Hold A and press start on the stage. Collect 50 or more rings and jump.
debug mode
Go to the sound test at the stage select. Play this accordingly,1,9,9,2,1,1,2,4.
Hold A and press start on the stage.
14 continues
Go to the sound test at tittle screen. Play this accordingly,1,1,2,4. Then go to the character select at the options screen and press start.