1. AACA-AA78 - Master code, must be entered

2. AM0T-AA5L + BD0T-AA42 - Invincibility

3. BD0T-AA42 - Almost invincible

4. HTVA-BAN2 + BJVA-AAE4 - Start with 10 hit points

5. HTVA-BAN2 + FAVA-AAE4 - Start with 40 hit points

6. HTVA-BAN2 + HTVA-AAE4 - Start with 60 hit points

7. HTVA-BAN2 + LAVA-AAE4 - Start with 80 hit points

8. HTVA-BAN2 + NTVA-AAE4 - Start with 100 hit points

9. HTVA-BAN2 + 9JVA-AAE4 - Start with 250 hit points

10. HTVA-BAN2 + 8TVA-ACE4 - Start with 500 hit points

11. HTVA-BAN2 + 72VA-AEE4 - Start with 750 hit points

12. HTVA-BAN2 + 66VA-AGE4 - Start with 999 hit points

13. HTVA-BAN2 + B6VA-ARN4 - Start with 9,999 hit points, counter looks funny until you get below 1,000

14. AWDA-AA5A - Makes all items cost nothing

15. B4AA-AA3F - Make ring power recharge cost nothing

16. RFWT-A6XT - Infinite ring power, must charge the ring once before the code takes effect.

17. GLAA-AAB0 + GK9T-AAFY - Recharge ring power to 50 instead of 255

18. NWAA-AAB0 + NV9T-AAFY - Recharge ring power to 100

19. 8WAA-ACB0 + 8V9T-ACFY - Recharge ring power to 500

20. 74AA-AEB0 + 739T-AEFY - Recharge ring power to 750

21. 68AA-AGB0 + 679T-AGFY - Recharge ring power to 999

Note: Codes 22 through 42 only work at the beginning of the game.
22. RETT-A606 + 9TTT-BCR8 + VATT-BGHA - Start with experience of 5,000

23. RETT-A606 + 9TTT-BCR8 + CATT-ARSA - Start with experience of 10,000

24. RETT-A606 + 9TTT-BCR8 + XATT-BYSA - Start with experience of 15,000

25. RETT-A606 + 9TTT-BCR8 + EATT-A61A - Start with experience of 20,000

26. RETT-A606 + 9TTT-BCR8 + ZATT-AC9A - Start with experience of 25,000

27. RETT-A606 + 9TTT-BCR8 + STTT-BFHA - Start with experience of 37,500

28. RETT-A606 + 9TTT-BCR8 + LATT-AH1A - Start with experience of 50,000

29. RETT-A606 + 9TTT-BCR8 + 96TT-B99A - Start with experience of 65.535

30. AATT-AAHR - Start with 0 gold

31. NTTT-AAHR - Start with 100 gold

32. FTTT-ACHR - Start with 300 gold

33. 8TTT-ACHR - Start with 500 gold

34. 1TTT-AEHR - Start with 700 gold

35. TTTT-AGHR - Start with 900 gold

36. VATT-BGHR - Start with 5,000 gold

37. CATT-ARSR - Start with 10,000 gold

38. EATT-A61R - Start with 20,000 gold

39. GATT-BL9R - Start with 30,000 gold

40. JATT-B3HR - Start with 40,000 gold

41. LATT-AH1R - Start with 50,000 gold

42. 96TT-B99R - Start with 65,535 gold

With codes 43 through 46, the power ring has no effect.
43. AH0A-BA3A + RH0A-A6VC - Make enemies harder to defeat

44. KD0A-AH3A - Make enemies easier to defeat

45. KD0A-AS3A - Make enemies very easy to defeat

46. KD0A-AD3A - Make enemies extremely easy to defeat