Shinobi 3: Return of the Ninja Master Cheats - Sega Genesis
Primary Collection of Cheats
Invincibility
Choose the "S.E." selection on the options menu. Press [B] to play the "He Runs", "Japonesque", "Shinobi Walk", "Sakura", and "Getufu" songs (in that order).
Unlimited weapons
Set the "Shurikens" selection on the options menu to 0. Set the "Sounds" option to "Shuriken". Highlight the "Shurikens" option again and the 0 will change into the symbol for infinity.
Bonus points
Complete a level without throwing any shurikens to receive a 30,000 point bonus.