Chopper is another really exciting Sumlock game... well, nearly! All you have to do is destroy the enemy convoy by bombing them, and not being shot by the "anti-aircraft gun". You can also be killed by heat seeking missiles, but these you can easily avoid by employing dodge tactics.
Another way to meet your maker is by trying to pay him a visit i.e. disappearing off the top of the screen. Crashing into canyon walls is also unadvisable. The canyon walls are not exactly foolproof either because if both sides are bombed in the right places and you are careful where you go, you fly off the sides. The graphics are about average but the sound could be improved.
Nevertheless I would recommend most games players take a good look at this one as it is fun to play.