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Ninja Gaiden is a series of video games by Tecmo featuring the dragon ninja, Ryu Hayabusa.

The series was originally known as Ninja Ryukenden ( Ninja Ryūkenden?, lit. "Legend of the Ninja Dragon Sword") in Japan. The word gaiden in the North American Ninja Gaiden title means "side-story" in Japanese, even though the Ninja Gaiden series is not a spinoff of a previous series. The original arcade title and early home installments of the series were usually known as Shadow Warriors in the PAL region.

The series gained popularity on the 8-bit Nintendo Entertainment System for its tight action-platform gameplay, catchy music and, according to G4's "X-Play," was also the first console game to have the story presented in cinematic cutscenes. The 8-bit trilogy was enhanced for the 16-bit Super NES in 1995. A new game, simply titled Ninja Gaiden, was released in 2004 as a 3D action game on the Xbox, developed by Team Ninja (the makers of Dead or Alive).