The following are known Game Genie Codes for Twin Cobra on SEGA Genesis.

• Start At Stage 2
  SANA-BJZY
• Start At Stage 3
  SANA-BNZY
• Start At Stage 4
  SANA-BTZY
• Start At Stage 5
  SANA-BYZY
• Start At Stage 6
  SANA-B2ZY
• Start At Stage 7
  SANA-B6ZY
• Start At Stage 8
  SANA-BAZY
• Start With 1 Life
  AEVA-BA9C
• Start With 10 Lives
  CAVA-BA9C
• Start With 25 Lives
  EYVA-BA9C
• Start With 50 Lives
  LAVA-BA9C
• Start With 99 Lives
  XEVA-BA9C
• Infinite Lives
  TEYT-AEZ4
• Start Turns With 1 Bomb Instead Of 3
  AEVA-AAFY
• Start Turns With 5 Bombs Instead Of 3
  AYVA-AAFY
• Start Turns With 7 Bombs Instead Of 3
  A6VA-AAFY
• Infinite Bombs
  AJYA-AA5R
• Start Turns With Green Weaponry
  9TVA-BCFG
  AEVA-AAFJ
• Start Turns With Blue Weaponry
  9TVA-BCFG
  AJVA-AAFJ
• Start Turns With Yellow Weaponry
  9TVA-BCFG
  ANVA-AAFJ
• Start Turns With Double Power Boost
  9TVA-BCFN
  AJVA-AAFR
• Start Turns With Triple Power Boost
  9TVA-BCFN
  ATVA-AAFR
• S Pick-Up Worth Nothing
  AT7T-AA8T
• S Pick-Up Gives 2X Power
  HE7T-BJ0T
• Bomb Pick-Up Adds 2 Bombs
  HE7T-BJ1T
• Bomb Pick-Up Adds 3 Bombs
  HE7T-BN1T
• Keep P Pick-Ups After Losing A Life
  HAVA-AE0L
• Start With 1 Credit
  9V6T-BGBE
  AF6T-AABG
• Start With 5 Credits
  9V6T-BGBE
  AZ6T-AABG
• Start With 10 Credits
  9V6T-BGBE
  CB6T-AABG
• Start With 25 Credits
  9V6T-BGBE
  EZ6T-AABG
• Start With 50 Credits
  9V6T-BGBE
  LB6T-AABG
• Start With 99 Credits
  9V6T-BGBE
  XF6T-AABG
• Infinite Credits
  JF6T-AEY6