Unlockables
Unlock ALL Levels
Press the C-Up button 7 times at the 'Press Start' screen.
Unlock King IO Chopper:
Complete mission 7 on 'Normal' difficulty setting.
Unlock Alien Weapon:
Beat Level 7 on the 'Expert' difficulty setting.
Unlock Stingray Chopper:
Complete mission 8 on 'Expert' difficulty setting.
We have more cheats and tips for this game here, Chopper Attack cheats
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