To use these codes, enter the OPTIONS menu and play the indicated sounds using the SFX option. The screen should shake if you've entered a code correctly.

Effect              Sound Sequence
Sonic-Zilla         0, 2, 1, 1, 6, 6 
Anti-Gravity Sonic  0, 9, 0, 1, 6, 8
                    To activate hold 1 + 2 + Start
Skip to the Boss    0, 2, 1, 5, 6, 6
                    To activate, press 1 + 2 + Start
Fast Music          0, 4, 2, 5, 5, 7