Final Boss battle: Hold Down + I and press Run at
the "Input your birthday" screen.
Sound test: Hold Up + I and press Run at the
"Input you birthday" screen to display the sound test
menu. Note: The duration that Run must be pressed is very
precise.
Adjust brightness: Enable the "Sound test" code. Press Select,
Up, Up, Down, Down, Left, Right,
Left, Right, II, I at the sound test
menu.
Mini-game: Enable the "Adjust brightness" code. Press
Select until a flashing red screen appears. Then, press
II, Up, Up, Down, Down, Left,
Right, Left, Right, II, I.
Use the D-pad to move, II to shoot, and I
to fire a smart bomb during the mini-game.
Monochrome mode: Press Select fifteen times in level one during
game play. Press Run to pause game play, then hold I
and press Up.
