Thunderstrike: Operation Phoenix
Level select:
Enter the options screen. Set "Vibration" to "1" and "Sound effects"
and "Music" to "0". Then, hold L1 + L2 + R1 + R2 + Circle + Square.
The message "Spooky Cat" will appear in the middle of the screen to
confirm correct code entry.
Ending bonuses:
Successfully complete the game under the hard difficulty setting.
The maniac difficulty setting and a bonus helicopter and will now
be unlocked. The bonus helicopter flies, turns, climbs, descends,
and shoots faster.
Successfully complete the game under the maniac difficulty setting
to unlock a third bonus helicopter, which you can use on any
difficulty setting. It has the same top speed and fire rate as
the second bonus helicopter, but more armor.
