The G.G. Shinobi

The G.G. Shinobi (ザ・GG忍) is a side-scrolling action game by Sega released for the Game Gear in 1991. It was the first Shinobi game developed specifically for a portable game platform. The player controls the modern-day ninja Joe Musashi, the protagonist of previous Shinobi games, as he goes on a mission to rescue four kidnapped comrades from an enemy, gaining control of the other ninjas (each with different abilities) as the game progresses in a manner inspired by Mega Man.