The following are known Game Genie Codes for Ys III: Wanderers from Ys on SEGA Genesis.

• AACA-AA78
  Master Code – Must Be Entered
• AM0T-AA5L + BD0T-AA42
  Invincibility
• BD0T-AA42
  Almost invincible
• HTVA-BAN2 + BJVA-AAE4
  Start with 10 hit points
• HTVA-BAN2 + FAVA-AAE4
  Start with 40 hit points
• HTVA-BAN2 + HTVA-AAE4
  Start with 60 hit points
• HTVA-BAN2 + LAVA-AAE4
  Start with 80 hit points
• HTVA-BAN2 + NTVA-AAE4
  Start with 100 hit points
• HTVA-BAN2 + 9JVA-AAE4
  Start with 250 hit points
• HTVA-BAN2 + 8TVA-ACE4
  Start with 500 hit points
• HTVA-BAN2 + 72VA-AEE4
  Start with 750 hit points
• HTVA-BAN2 + 66VA-AGE4
  Start with 999 hit points
• HTVA-BAN2 + B6VA-ARN4
  Start with 9,999 hit points (The counter looks funny until you get below 1,000)
• AWDA-AA5A
  Makes all items cost nothing
• B4AA-AA3F
  Make ring power recharge cost nothing
• RFWT-A6XT
  Infinite ring power but you must charge the ring once before the code takes effect.
• GLAA-AAB0 + GK9T-AAFY
  Recharge ring power to 50 instead of 255
• NWAA-AAB0 + NV9T-AAFY
  Recharge ring power to 100
• 8WAA-ACB0 + 8V9T-ACFY
  Recharge ring power to 500
• 74AA-AEB0 + 739T-AEFY
  Recharge ring power to 750
• 68AA-AGB0 + 679T-AGFY
  Recharge ring power to 999
• RETT-A606 + 9TTT-BCR8 + VATT-BGHA
  Start with experience of 5,000
• RETT-A606 + 9TTT-BCR8 + CATT-ARSA
  Start with experience of 10,000
• RETT-A606 + 9TTT-BCR8 + XATT-BYSA
  Start with experience of 15,000
• RETT-A606 + 9TTT-BCR8 + EATT-A61A
  Start with experience of 20,000
• RETT-A606 + 9TTT-BCR8 + ZATT-AC9A
  Start with experience of 25,000
• RETT-A606 + 9TTT-BCR8 + STTT-BFHA
  Start with experience of 37,500
• RETT-A606 + 9TTT-BCR8 + LATT-AH1A
  Start with experience of 50,000
• RETT-A606 + 9TTT-BCR8 + 96TT-B99A
  Start with experience of 65.535
• AATT-AAHR
  Start with 0 gold
• NTTT-AAHR
  Start with 100 gold
• FTTT-ACHR
  Start with 300 gold
• 8TTT-ACHR
  Start with 500 gold
• 1TTT-AEHR
  Start with 700 gold
• TTTT-AGHR
  Start with 900 gold
• VATT-BGHR
  Start with 5,000 gold
• CATT-ARSR
  Start with 10,000 gold
• EATT-A61R
  Start with 20,000 gold
• GATT-BL9R
  Start with 30,000 gold
• JATT-B3HR
  Start with 40,000 gold
• LATT-AH1R
  Start with 50,000 gold
• 96TT-B99R
  Start with 65,535 gold
• AH0A-BA3A + RH0A-A6VC
  Make enemies harder to defeat
• KD0A-AH3A
  Make enemies easier to defeat
• KD0A-AS3A
  Make enemies very easy to defeat
• KD0A-AD3A
  Make enemies extremely easy to defeat