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Cheat menu:
Pause the game and highlight the "BGM Volume" option.
Hold L + Z + B + X + C + R (in that order).
A cheat menu will appear when all the indicated buttons are held.
The cheat options allow levels, ammunition, power, and lives to be adjusted.
Highlight a cheat option and rapidly press C to increase its value.
After the cheat menu is enabled, it may be redisplayed at any time by pressing L while the game is paused.