Shinobi III - Return of the Ninja Master.

 No.  Code  Effect

All these codes only work on the default difficulty level.

   1  CJSA-EA7G  Infinite energy
   2  CBTT-AAC8  Start with 1 life

For Codes 3 Thru 5 the Game only displays a maximum of 9 lives.

   3  CBTT-AYC8  Start with 11 lives
   4  CBTT-BCL8  Start with 50 lives
   5  CBTT-AG48  Start with 99 lives
   6  SE3A-FLZ2  Each throw costs 2 shurikens--7 for Shuriken Burst  
   7  HVTT-AG5Y  Start with 99 shurikens
   8  RFST-G6ZC  Get no shurikens on pick up
   9  JBST-HAZC  Get 8 shurikens on pick up
 10  AT3A-EA72  Infinite shurikens--7 for Shuriken Burst
 11  ABTT-BAEE  Start with no ninjitsu items
 12  AZTT-BAEE  Start with 5 ninjitsu items
 13  BFTT-BAEE  Start with 9 ninjitsu items
 14  AT1T-EA4E  Infinite ninjitsu items

You cannot combine credit codes (15 Thru 18 ) with start on round codes (19 Thru 24)

 15  APTT-AAD6  Start with 1 credit instead of 3
 16  APTT-ALD6  Start with 5 credits
 17  APTT-AWD6  Start with 9 credits
 18  AX6T-AA2E  Infinite credits

When using start on round codes (19 Thru 24), you will only have 1 Credit.

 19  Y2NA-DRJ2 + APTT-ACD6  Start on round 2
 20  Y2NA-DRJ2 + APTT-AED6  Start on round 3
 21  Y2NA-DRJ2 + APTT-AGD6  Start on round 4
 22  Y2NA-DRJ2 + APTT-AJD6  Start on round 5
 23  Y2NA-DRJ2 + APTT-ALD6  Start on round 6
 24  Y2NA-DRJ2 + APTT-AND6    Start on round 7