Ninja Hattori-kun (忍者ハットリくん, Ninja Hattori-kun, lit. "Little Ninja Hattori") was a video game software developed and published by Hudson Soft for the Nintendo Family Computer on 5th March 1986 exclusively in Japan. Its subtitle is: "Ninja Training".
The game is based on Fujiko Fujio A's (Motoo Abiko) Japanese manga series of the same name, which later became an anime series. The game was released around the same time the anime was aired. It was the fifth best selling Famicom game released in 1986, selling about 1,500,000 copies in its lifetime.
In the game, the player controls Kanzo Hattori in a parallax-scrolling action game. Hattori would go over various terrains, primarily through the woods and defeat enemies. As the game progresses, Hattori can learn 12 different Ninja Techniques, such as the flying squirrel and angry fireball techniques to help him.
Similarly to the manga, the plot begins when a young ninja name Kanzo Hattori encountering a young 10-year-old boy named Kenichi Mitsuba while he was in search of his master in order to complete his training. He made Kenichi his temporary replacement master, in order to develop Ken's confidence, while they went on many adventures together.