All Weapons:
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Pause gameplay and press Up, Up, Down, Down, L, R, L, R, B, A.
Challenge B mode:
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Successfully complete the game in Challenge A mode.
Challenge A mode:
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Successfully complete the game to unlock the ''Challenge A'' option
at the main menu.
Delete saved game:
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Enter the options screen, highlight "Exit", then hold L + R + B and
press Start.
Self-destruct:
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Press Start to pause game play, then press Up(2), Down(2), Left,
Right, Left, Right, B, A, Start.
All power-ups:
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Press Start to pause game play, then press Up(2), Down(2), L, R, L,
R, B, A, Start. Note: This can only be done a limited number of
times until it causes your ship to self-destruct.