Ninja Spirit is a platform game released by Irem in 1988. The game is set in feudal Japan, where the player controls a ninja named Tsukikage, who seeks revenge for his father's death. The game features seven stages, each with different enemies and obstacles. The game also has a unique feature, where the player can collect power-ups that summon animal spirits, such as a wolf, a dragon and a tiger, which can assist the player in combat.