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Defend Earth from Alien Invaders. Your starship is equipped with pulse lasers which you can fire by tapping the fire button. Beware the Alien Invaders are equipped with homing missiles and lasers. Tilt left/right to change directions. Tilt up/down to control speed.Three Modes available: Easy, Normal and Hard Tilt Left/Right - Control ship direction Tilt Forward - Move Forward Tilt Up - Go Backwards Touch Fire button - Shoot Laser Destroy Enemy Ships = 100 points, Missiles = 50 points , Lasers = 10 points GameCenter enabled