Ninja Gaiden (NINJA外伝?), known in Japan as Ninja Ryūkenden (忍者龍剣伝?, literally "Legend of the Ninja Dragon Sword") and as Shadow Warriors in Europe, is a side-scrolling platforming video game. It was developed and published by Tecmo for the Nintendo Entertainment System (NES); its development and release coincided with the beat 'em up arcade version of the same name. It was released in December 1988 in Japan, in March 1989 in North America, and in September 1991 in Europe. It was ported to the PC Engine in Japan in 1992, to the Super NES as part of the Ninja Gaiden Trilogy compilation in 1995, and to mobile phones in four planned episodic installments in 2004. It was released on the Wii's Virtual Console service for all regions in 2007.
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