The following are known Game Genie Codes for Back to the Future Part III on SEGA Genesis.

• Infinite Lives In Buckboard Chase
  BDCT-AA8N
  BDDT-AA5W
• 2 Lives In Buckboard Chase
  AGJA-AADN
• 6 Lives In Buckboard Chase
  A0JA-AADN
• 10 Lives In Buckboard Chase
  BGJA-AADN
• 20 Lives In Buckboard Chase
  CRJA-AADN
• Shooting Gallery Timer Runs At 4X Normal Speed
  A85T-EAGY
• Shooting Gallery Timer Runs At 3X Normal Speed
  BL5T-EAGY
• Shooting Gallery Timer Runs At 2X Normal Speed
  B85T-EAGY
• Shooting Gallery Timer Runs At 1/2X Normal Speed
  HW5T-EAGY
• Shooting Gallery Timer Runs At 1/3X Normal Speed
  ML5T-EAGY
• Shooting Gallery Timer Runs At 1/4X Normal Speed
  SC5T-EAGY
• Shooting Gallery Timer Runs At 1/10X Normal Speed
  FW5T-ECGY
• Small Ducks Worth 1,550 In Shooting Gallery
  C1AT-EAAY
• Small Ducks Worth 15,550 In Shooting Gallery
  L1AT-ECAY
• Small Ducks Worth 155,550 In Shooting Gallery
  L1AT-FLAY
• Flying Ducks Worth 12,200 In Shooting Gallery
  EMBA-ECF6
• Flying Ducks Worth 122,200 In Shooting Gallery
  EMBA-FEF6
• 4 Hits Allowed In Pie-Throwing Level
  A95A-GAF0
• 6 Hits Allowed In Pie-Throwing Level
  A15A-GAF0
• 8 Hits Allowed In Pie-Throwing Level
  AS5A-GAF0
• Infinite Hits Allowed In Pie-Throwing Level
  ATGA-JA4A