The Karate Kid is a licensed NES game based on the popular movie franchise. Gameplay likely involved the player controlling the main character, Daniel LaRusso, as he progressed through challenges related to the movie's plot or similar scenarios.  It would likely feature martial arts combat elements, possibly integrating puzzle or adventure game elements.  The game's specific mechanics and style would depend on the game's developer and how they adapted the movie's narrative into a NES game experience.  Details of the specific gameplay may vary significantly.

Karate Kid, The (USA)

Karate Champ (Japan)