The following are known Game Genie Codes for Thunder Force III on SEGA Genesis.

• Master Code – Must Be On
  RYBT-A6XY
• Start With 2 Fighters
  AECA-AAH8
• Start With 7 Fighters
  A2CA-AAH8
• Start With 10 Fighters
  BECA-AAH8
• Infinite Fighters
  A3AT-AA7R
• Start With 2 Credits Instead Of 7
  AECA-AAF8
• Start With 5 Credits Instead Of 7
  ATCA-AAF8
• Start With 13 Credits Instead Of 7
  BTCA-AAF8
• Infinite Credits
  A2FT-AA8C
• Keep Special Weapon Power When You Lose A Fighter
  AKAT-AA8R
• Start With All Special Weapons Available
  9TCA-BGSR
  D6CA-AAHT
  96CA-AAHW
• Never Get Special Weapons Ability
  AKAA-AA6W