Sky Shark, a title released in the USA for NES, is a vertically scrolling shooter. The "Rev 0A" designation suggests a revision of the game, which might indicate bug fixes or minor gameplay adjustments from an earlier release.   The core game loop, like other games in its genre, likely centers on the player controlling a fighter plane and navigating through various stages while shooting down enemies and avoiding collisions.

Sky Shark (USA) (Rev 0A)

Sky Destroyer (Japan)