The following are known Action Replay Codes for Shinobi III: Return of the Ninja Master on SEGA Genesis / Mega Drive (Genesis).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay

• Alternate SEGA Logo Intro
  FF001D:64
• Infinite Shurikens
  FF37E3:32
• Infinite Health
  FF37E9:10
• Start On Round Modifier 1
  FF37A6:??
• Auto Kill! 2
  FF415B:2A
• Jitsu of Ikazuchi (Lightning) Enabled
  FF415F:04
• Infinite Jumps
  FF377C:00
• Have Flaming Shurikens 3
  FF00E7:01
• Infinite Lives
  FF37E-00009
• Invincibility
  FF416-5000F
• Infinite Shurikins
  FF37E-30046
• Infinite Ninjitsu
  FF37E-60003

Only use one of the following 3 codes at a time…

• Ghost Shinobi
  FF4165:1F
• Enemies Can’t Touch You (No Flashing)
  FF4165:01
• Moon Jump 4
  FF4160:8B
  FF4161:02

Footnotes

• 00 – Round 1: Zeed’s Resurrection
  01 – Round 2: Secret Entry
  02 – Round 3: Body Weapon
  03 – Round 4: Destruction
  04 – Round 5: Electric Demon
  05 – Round 6: Traps
  06 – Round 7: The Final Confrontation
• Kill yourself whenever you feel the need to.
• This will only work if it is on before the level loads and/or reloads. It still has the get-hit-lose-the-power effect. You could just use the invincible code with it.
• Either of these can be used for a moon jump code.