Shadow of the Ninja (1990)

Shadow of the Ninja, originally released in Japan as Yami no Shigotonin Kage (闇の仕事人 KAGE, The Darkness Worker Kage) and later released in Europe and Australia as Blue Shadow, is a side-scrolling action game developed by Natsume for the Nintendo Entertainment System (NES) in 1990. The game revolves around a pair of ninjas sent to assassinate a dictator in a futuristic version of New York City. A port was planned for the Game Boy, but was released in rebranded form as Ninja Gaiden Shadow.