Cover of the Amstrad CPC version
Bits Studios (Game Boy)
|Platform(s)||Arcade, TurboGrafx-16, Amiga, Amstrad CPC, Atari ST, Commodore 64, Game Boy, ZX Spectrum, Virtual Console|
The game's hero, Tsukikage (月影), is a young ninja who lost his father to a mysterious half-man half-beast creature. The plot of Ninja Spirit is based on the quest of his way to avenge his father in an alternative feudal Japan.
Tsukikage's journey takes him through seven stages, varying from woodlands, wastelands, swamps, temples and cliffs. Each stage begins with the player slashing his way to the end, until he confronts a level boss.
The ninja is always armed with the katana, Righteous Cloud, which can be fluidly used to attack in all directions. Extra weapons include the Swirling Leaf (shurikens), the Bamboo Thunder (bombs), and the Rising Dragon/Shouryu (kusarigama). There are also several power-up items, such as one unleashing multiple ninja ghosts to assist the player.
The game was successfully ported onto multiple platforms. The most popular port is the TurboGrafx-16 format which includes two styles of mode: the PC engine mode which players lose one ninja only if all 5 energy points are used up (certain enemies can kill Tsukikage with one hit), and the Arcade mode, which is a more challenging mode where any attack are grounds for players to lose one ninja instantly. That version was ported to the Nintendo Wii's Virtual Console on May 14, 2007, was delisted on March 30, 2012 and was available again on September 17, 2013 in Japan and on September 19, 2013 in North America and Europe. The same version was republished to the Nintendo Wii U's Virtual Console on January 14, 2015 in Japan, July 27, 2017 in North America and August 10, 2017 in Europe. 
Ninja Spirit later appeared in the Japan-only Game Boy title, Shuyaku Sentai Irem Fighter along with other characters from the game, as well as characters from three other Irem franchises: R-Type, Mr. Heli and Hammerin' Harry.
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Ninja Spirit for the Turbografx-16 was also the first game in history to receive a 10 in Electronic Gaming Monthly. In 2010, CraveOnline featured this version in the article Top 10 Ninja Games Of All Time, commenting: "Ninja Spirit for the TurboGrafx-16 was a lot like “Legend of Kage” on the NES, except better in every way ... both challenging and sort of relaxing at the same time."
- Saigo no Nindou: Ninja Spirit (Game Boy) at GameFAQs
- 15A3-3 | Saigo no Nindou - VGMdb
- Top 10 Ninja Games Of All Time, CraveOnline, September 18, 2008