Chopper must be one of the worst games I have ever come across. The spectacular cassette insert is very misleading; with such colourful art you might expect the game to look something like it.
The so-called hi-res graphics are basic, with black figures representing a guided missile launcher, vans trucks, tanks, and the chopper. The only colour is in the ground surface and the underground missile base from where you are being constantly fired at.
As the chopper pilot, you have to bomb the passing vehicle while avoiding the enemy barrage (from the undestroyable underground base) and the guided missile (which is near impossible to outfly because it flies as fast as you and your direction change is too slow).
The game is not enjoyable at all because you can not move and fire at the same time. Poor sound, too.