View hidden endings:
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Go underground in the Junkyard stage. Locate the wall before
the door with the mounted guns. Climb this wall to find a man
that will allow you to fight three Bosses in an arena. Defeat
your opponents to view the ending sequences.
All weapons (Japanese version):
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Pause game play and press Up(2), Down(2), A,
Up(2), Down(2), B, Up(2), Down(2), C.
Super weapon:
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Pause game play and press Up(2),
Down(2), A, Up(2), Down(2), B.

Although posted as a valid code:
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on other web sites, it does not function in the retail version
of the game.
Level skip:
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Press A, B, C,
Up + C at the beginning of the game. The phrase
"Player One or Player Two" will be heard to confirm
correct code entry.

70 lives:
---------
Press [C, B, A,
Right, Left] three times on controller two at the
title screen.


Level select:
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Press [A, B, C,
Right, Left] three times on controller two at the
title screen.