You fly your helicopter through an area full of hostile bats and other monsters. Try to eliminate them all by shooting at them and by dropping bombs. Watch out not to be hurt yourself! Try to collect extra lives (hearts) and points (padlocks).
Use the mouse to move and click to fire. Press the spacebar to place a bomb. This bomb will explode when you'll press the spacebar another time. You can also throw bombs from your helicopter by flying into your target's direction, dropping a bomb (press spacebar) and detonating it (press spacebar).