Codes work only on default difficulty level
1. CJSA-EA7G Infinite energy

2. CBTT-AAC8 Start with 1 life

Game displays max 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 shurikins, 7 for Shurikins Burst

7. HVTT-AG5Y Start with 99 Shurikins

8. RFST-G6ZC Get no Shurikins on pick up

9. JBST-HAZC Get 8 Shurikins on pick up

10. AT3A-EA72 Infinite Shurikins, 7 for Shurikins 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

Cannot combine "credit" codes with "start on round" codes
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," you will have only 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