World Select:
While in a level press START to pause the game and hold the Z button.
While holding Z, press R, B, A, B, A, Up-C, Down-C, Left-C, Right-C,
Up-C, Down-C, Left-C, Right-C. A tone will sound and the option
"Unlock Worlds" will appear. Highlight the option and turn itto "Yes"
to access all the worlds.