Shinobi (Sega Master System)

You're Jo-Musashi, a mild-mannered martial arts instructor. But you have another job as well. When duty calls, you're a Master Ninja! Your mission: An evil terrorist network, the Ring of Five, has kidnapped the children of the world's leaders! You must get the hostages back... and defeat the Ring of Five! They're waiting for you with gunmen, thugs, mongos and green ninjas. But you alone have the power of Ninja Magic!