Charge 'n Blast Codes -

Easy mode:
Press [X, B, Y, A] four times at the title screen. The phrase "Easy game" will be spoken to confirm correct code entry. Your weapons will charge faster than normal. Alternately, press X, B, Y, A, X, B, Y, A, X, B, Y, A, X, B, Y at the title screen.

Spread Rocket:
Successfully complete the game under the easy difficulty setting. A man with a Spread Rocket special weapon will be unlocked.

Hyper Laser:
Successfully complete the game under the normal difficulty setting. A woman with a Hyper Laser special weapon will be unlocked.