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Ninja-kun: Majô no Bôken Nintendo
An action platformer for the Arcades produced by UPL. It was later ported to the Famicom by Jaleco. It's known as Ninja-kun in Japan, and is the first of the Ninja-kun series.
Ninja-Kid is an action platformer Arcade game created by Japanese developer UPL and published by Jaleco. In Japan it is known as Ninja-Kun. Jaleco released their own version of Ninja-Kun, with the subtitle Majou no Bouken ("Adventure at Demon Castle" or thereabouts), for the Nintendo Famicom in 1985 in Japan only. Jaleco would also go on to port UPL's sequel Ninja-Kun II to the NES as well, and then continue to publish their own "spin-off" Ninja-Kun games under the title Ninja JaJaMaru-kun, who is canonically said to be the original Ninja-Kun's younger brother.
Neither Ninja-Kun nor Ninja JaJaMaru-Kun were seen often outside of Japan, but both of UPL's original Arcade games were released in the US as Ninja-Kid I and Ninja-Kid II respectively. The game has nothing to do with Bandai's Ninja Kid NES game, which is actually a graphically altered version of the first NES game they made based on the Gegege no Kitarou anime/manga license.