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

• Normal-Game Clock Starts At 100
  AATA-ACBE
• Normal-Game Clock Starts At 200
  AATA-AEBE
• Normal-Game Clock Starts At 250
  LATA-AEBE
• Long-Game Clock Starts At 400
  AATA-AJB2
• Long-Game Clock Starts At 500
  AATA-ALB2
• Long-Game Clock Starts At 750
  LATA-ARB2
• Long-Game Clock Starts At 999
  XETA-AWB2
• Infinite Time (Most Of Game)
  AJTA-AA6A
• Start With 1 Life
  AANT-AADW
• Start With 2 Lives
  AENT-AADW
• Start With 4 Lives
  ANNT-AADW
• Start At Stage 2
  AJNT-AABT
• Start At Stage 3
  ANNT-AABT
• Start At Stage 4
  ATNT-AABT
• Start At Stage 5
  AYNT-AABT
• Start In Stage 5 Against Giant Robot
  A2NT-AABT
• Flamethrowers Have Less Fuel
  JZWA-AAGC
• Each Bazooka Holds 2 Rounds
  AKWA-AAGG
• Each Bazooka Holds 5 Rounds
  AZWA-AAGG
  AZXA-AAAG
  AZXA-AAAR
• Each Bazooka Holds 9 Rounds
  BFWA-AAGG
  BFXA-AAAG
  BFXA-AAAR
• Each Machine Gun Holds 10 Rounds
  CBWA-AAF8
• Each Machine Gun Holds 25 Rounds
  EZWA-AAF8
• Each Machine Gun Holds 50 Rounds
  LBWA-AAF8
  LBXA-AAAC
  LBXA-AAAL
• Each Machine Gun Holds 99 Rounds
  XFWA-AAF8
  XFXA-AAAC
  XFXA-AAAL
• No Loss Of Life If Sucked Into Space
  BBFA-AA46
• All Weapons Have Unlimited Capacity
  AAZT-AADN
  ABCT-AAD0
• Invincibility
  A2VT-AA3R
• Start With 2 Credits
  AENT-AAB0
  AENT-AACG
• Start With 4 Credits
  ANNT-AAB0
  ANNT-AACG
• Start With 8 Credits
  A6NT-AAB0
  A6NT-AACG
• Start With 10 Credits
  BENT-AAB0
  BENT-AACG
• Infinite Credits
  AC6T-AAEW