I think it was Tiger Heli from NES. Most NES games were hard as hell and I wasn't able to finish it, but I enjoyed anyway and replayed until I got my hands on double dragon 2. In my childhood I didn't mind to replay the game after the gameover screen (only if I got very, very frustrated), and the majority of games of this era relied upon difficulty to add replay value, so there wasn't much to do.
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