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Adjust brightness:
Enable the "Sound test" code. Press Select, Up, Up, Down, Down,
Left, Right, Left, Right, II, I at the sound test menu.
Final Boss battle:
Hold Down + I and press Run at the "Input your birthday" screen.
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.
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.
Unlimited extra lives:
Pause and resume game play one hundred times. All enemies
that are shot will turn into bonus lives.
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