# Instant double shot power-up

Pause the game after passing the first Boss and press Up(2), Down(2), Left, Right, Left, Right, L2, R2. If you entered the code correctly, you will hear a sound. Note: This may only be up to 25 times, equal to the number of levels that have been successfully completed.
# Instant laser shot power-up

Pause the game after passing the first Boss and press Up(2), Down(2), Left, Right, Left, Right, L1, R1. If you entered the code correctly, you will hear a sound. Note: This may only be done up to 25 times, equal to the number of levels that have been successfully completed.
# Bonus credit

Every hour of accumulated game play will add one bonus credit to your total.
# Free play

Accumulate 18 hours of game play to unlock free play mode (unlimited credits).
# Weapon edit mode

Successfully complete the game. Press R1 in the weapon selection screen to turn on weapon edit mode. Press L1 to return to the normal weapon selection.