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

• Start With 2 Lives
  AEET-AAAA
• Start With 7 Lives
  A2ET-AAAA
• Start With 10 Lives
  BEET-AAAA
• Start With 21 Lives
  CTET-AAAA
• Start With 51 Lives
  GJET-AAAA
• Start With 91 Lives
  MJET-AAAA
• Infinite Lives (Top-View Missions Only)
  ATSA-AA2T
• Infinite Lives (Side-View Missions Only)
  ATKT-AA4Y
• Start With 1 Credit
  AEET-AAFJ
• Start With 4 Credits
  ATET-AAFJ
• Start With 9 Credits
  BEET-AAFJ
• Start With 25 Credits
  DEET-AAFJ
• Start With 50 Credits
  GJET-AAFJ
• Start With 90 Credits
  MJET-AAFJ
• Infinite Credits
  ATEA-AA20