Take aim, fire!
Chase your opponents and shoot them down.
Use the radar map to locate your opponents. Fly your helicopter close to them for long enough to score a 'hit'. After several hits are scored your opponent will be grounded.
Control your helicopter by moving your device. Tilt your device to fly in a particular direction. Lift/drop your device to fly higher/lower.
As you progress through the levels your opponents will use a wider variety of evasive manoeuvres, from simply trying to out-run you to weaving horizontally and vertically.
Lock in Portrait Mode
This game is best played with your device locked in portrait mode.
(The screen will otherwise flick between portrait and landscape as you tilt your device.)
To lock your device in portrait mode: