An ancient preview of this game in an issue of Electronic Gaming Monthly from 1989 calls the game Shinobi Kidd. The first boss in the game is a large samurai called Kabuto. However, in the preview they showed a screen of the same boss, and he looked all too much like a beloved plumber of which everybody knows. And his name was MARI-OH. MARI-OH. What was Sega thinking? Thank god they changed things around before it got ugly.