Press left x2, right x8, left x6, right x2, left x7, right x6, left x8 on the title screen. You will get to the debug mode, you start with all powerups, items and transformations and can travel to any map.

Code	Effect
Hold Select+A	Free movement
Press select on the pause screen	Return to debug screen
Select M! with A button in debug screen	Sound test
Select M! with B button in debug screen	Music test