1001 Video GamesThe SNES version of The Legend of the Mystical Ninja appears in the book 1001 Video Games You Must Play Before You Die by General Editor Tony Mott.
Gradius mini-gameIn the Amusement Park stage (Stage 3), there's a Game Center that carries a game. The entire first stage of Gradius is hidden in Mystical Ninja as a Game Center mini-game!
Konami codeOne of the villagers tells you that nothing will happen if you press up, up, down, down, left, right, left, right, B, A. This button-combination is a cheat that works in almost every Konami game.
US versionGoemon and Ebisumaru were renamed to Kid Ying and Dr. Yang in the U.S. version.
Information also contributed by Mobygamesisreanimated