Level select
Finish arcade mode on the combat mode difficulty level
to unlock the new options at the configuration screen.
Unlock free play mode:
Play the game a total of 200 times.
Free play mode code:
When you are at the "Press Start" screen, hold L1 + L2 + R1 + R2 buttons
and press Start on your controller. Keep held L1 + L2 + R1 + R2 buttons,
and press Up(7 times), Down, Up(4 times), Start. If the code is accepted,
you will hear the phrase "Limiter released". Enter to the configuration
screen and turn off the credit limit to activate the free play mode.
Unlock Thirteen ships mode
Finish extra mode on the combat mode difficulty level to unlock the new
options at the configuration screen.
Unlock Shooting down rate
Finish extra or arcade mode on the 13 ships mode difficulty level
to unlock the new options at the configuration screen.
Bonus credits (Only in japanese version of the game):
Repeatedly press Select at the title screen. You can increase the
total credits up to 9.
