The Heli Attack run-and-gun series, from the original through Heli Attack 3.
SquareCircleCo's opening run-and-gun: one soldier, one machine gun and an endless wave of enemy helicopters.
Hold the clearing while the choppers come in waves, and take as many of them down as the sky will send.
The choppers are back and this time there are thirty-odd weapons to answer them with, across snow, jungle, canyon and lab.