8-Bit Soundtrack Cheat Code
When the Capcom logo appears at the start of the game press Down, RB, Up, LB, X, A. If you have entered the code correctly you will hear a confrimation sound and the '8 -Bit Audio Mode' selection will appear at the 'Options' menu.
Unlock Bonus Level:
This feature is accessed by entering any level when you have a 7 in any digit of your money total.
Unlock 8-Bit Soundtrack
When you have successfully completed the game this feature will become unlocked.