At time during gameplay, press START to pause and select the "Scrapbook" option from the pause menu. Enter any of the following codes:

Code - Effect

Left, Up, X, A, Left, Up, X, A, Left, Up, X, A, Up, Up, Up, Up, Up - Unlock all Levels
Left, Up, X, A, Left, Up, X, A, Left, Up, X, A, Up, Right, Down, Left, Up - Refills heath meters