Ninja-kun's Demon Castle Adventure (Ninja-kun Ma-jō no Bōken) is the first video game in the Ninja-kun series. It was released for arcades, on the Famicom, and MSX by Jaleco in 1984.
Ninja-kun's Demon Castle Adventure features three upward scrolling levels that repeat and become more difficult. The objective is to defeat the enemies on each screen and advance to the next screen. The player can attack with shurikens and jump on enemies' heads to stun them. Occasionally, an orb will appear and if the player collects three, a bonus level will be unlocked.
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