David's Nintendo Code Book

SHINOBI III: RETURN OF THE NINJA MASTER (vc-gen)

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 =>Invincibility: In the Options menu, select the BGM option then play the
   following songs: He Runs, Japonesque, Shinobi Walk, Sakura, and Getufu.
   If entered correctly, the final song will not play. Start the game and
   you'll be invincible.
 =>Unlimited Shurikens: Enter the Options menu and set the Shuriken count to
   0. Set the sound effects option to Shuriken, then move the cursor back to
   the Shurikens option and leave it there for a bit, until the 0 changes to
   the infinity symbol.
 =>30,000 Point Bonus: Finish a level without using any shurikens to receive
   a 30,000 point bonus.