The following are known Game Genie Codes for Flashback: The Quest for Identity on SEGA Genesis.

• AJ2T-AA3C
  Never lose a shield when shot (This may make some enemies invincible and you will have to switch off the Game Genie to kill them.)
• AT2T-AA44
  Protection from some falls but beware some falls still kill you
• AM2A-WAH4
  Start with 1 shield
• AS2A-WAH4
  Start with 2 shields
• AX2A-WAH4
  Start with 3 shields
• A52A-WAH4
  Start with 5 shields
• BS2A-WAH4
  Start with 10 shields
• C12A-WAH4
  Start with 20 shields
• GS2A-WAH4
  Start with 50 shields
• N12A-WAH4
  Start with 100 shields
• GM6T-WAA4
  Start with 50 credits
• NX6T-WAA4
  Start with 100 credits
• HV9T-BELR + NV9T-AACT
  Credit Packs worth 100 credits
• HV9T-BELR + 7B9T-AGCT
  Credit Packs worth 1,000 credits
• HV9T-BELR + CB9T-ARLT
  Credit Packs worth 10,000 credits
• RGBT-A6T4
  Always have enough money to buy anything
• RGBT-A6XN
  You do not need to charge the magnetic cartridge