Shinobi III: Return of the Ninja Master Cheats For Sega Genesis
Invincibility
To gain invincibility, go to the options menu, and under Music, play He runs, Japonesque, Shinboi Walk, Sakura, Getufu in that particular order.
Unlimited Shurikens
To get unlimited shurikens, go to the options menu and set the amount of Shurikins to 00. Next, go down to sound effects (S.E.) and set it to Shurikin. After doing that highlight the Shurikins option again and the 00 will turn into an infinite or unlimited symbol.

Bonus Points
To get bonus points on each level or stage, beat the level without using any shurikens. Doing this will grant you 30,000 points when completing a level.
Shinobi III: Return of the Ninja Master Game Genie Codes
The following cheat codes are for Game Genie. These can be used on a Sega Genesis with a Game Genie device or you can use these on any emulator that supports Game Genie Codes. If you want a Game Genie Device, you can always check on Amazon for one.

Cheat Effect
Cheat Code

Infinite health
CJSA-EA7G

Infinite lives
AW2A-AA60

Infinite continues
AX6T-AA2E

Invincibility
RYSA-E6T4

Infinite jumps
82HT-EH0E

Infinite shurikens
AT3A-EA72

Infinite ninjitsu items
AT1T-EA4E

Start with 11 lives
CBTT-AYC8

Start with 50 lives
CBTT-BCL8

Start with 99 lives
CBTT-AG48

Start with 5 continues
APTT-ALD6

Start with 9 continues
APTT-AWD6

Start with 99 shurikens
HVTT-AG5Y

Make game region free
BL0T-AN7T

Start on level 2
Y2NA-DRJ2 + APTT-ACD6

Start on level 3
Y2NA-DRJ2 + APTT-AED6

Start on level 4
Y2NA-DRJ2 + APTT-AGD6

Start on level 5
Y2NA-DRJ2 + APTT-AJD6

Start on level 6
Y2NA-DRJ2 + APTT-ALD6

Start on level 7
Y2NA-DRJ2 + APTT-AND6

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