How To: Bonus helicopters and difficulty setting
Successfully complete the game on the hard difficulty setting to unlock a bonus helicopter and the "Maniac" difficulty setting. The bonus chopper flies faster, turns faster, ascends/descends faster, the front-mounted cannon fires faster and takes longer to overheat and cools faster, and the rotor sounds a little different. Successfully complete the game on the "Maniac" difficulty setting to unlock another bonus helicopter, which you can use on any difficulty setting. It has the same top speed and fire rate as the other bonus helicopter, but more armor.
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