Ninja Crusaders is a side-scrolling action game released by Sammy for the Nintendo Entertainment System in 1990. The player takes control of one of two ninjas who are tasked at thwarting an alien invasion. The game has been compared to Tecmo's Ninja Gaiden series.

Ninja Crusaders is a side-scrolling action game that can be played by up to two players simultaneously. There are four weapons that player can pick up and use during the game: shuriken, kusarigama, bō and sword. Each weapon has its unique style and transformation ability: shuriken provides the ability of transforming into tiger, which is the fastest and can jump the highest but has the shortest range; kusarigama provides the ability of transforming into sea scorpion, which can swim better than all the rest but moves very slowly on land; bō provides the ability of transforming into falcon, which has the ability to fly above everything but cannot attack at all; and finally sword provides the ability of transforming into dragon, which can fly, is invincible, and kills everything in one hit, but the player can only use this ability only once and only for a limited amount of time, also sword itself rarely appears in the game.