Chopper is a very fast game, and though keyboard control is available, I wouldn't recommend it. You control a helicopter bombing lorries, tanks and missile-launchers. Ranged against you is an anti-aircraft gun moving side-to-side very fast, firing random flak.
Flying hours are further curtailed by missiles from the launchers and this pilot was not skilled enough to discover whether the fast-flying missiles could be dodged long enough to earn bonus points.
Flying into the ground or screen sides are elementary navigation errors, but it's hard that crashing into the sky (screen top) also costs a life! 600 is said to be a high score. I got nowhere near it.
Graphics are realistic - the simulation of rotating chopper blades is a nice touch, but the chopper crashes could be quicker. Sound effects are satisfactorily noisy.
Answering NO to REPLAY? produces nothing. Once in program you stay in until the power fails. Is this a software device for encouraging addiction, I wonder?