Instant double shot power-up:
Pause the game play after passing the first Boss and press Up(2), Down(2),
Left, Right, Left, Right, L2, R2. A sound will confirm correct code entry.
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 game play after passing the first Boss and press Up(2), Down(2), Left,
Right, Left, Right, L1, R1. A sound will confirm correct code entry.
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.
Sites: