The following are known Game Genie Codes for Contra: Hard Corps on SEGA Genesis.

• Region Bypass Code
  CTBT-AA6J
  A2BT-AA72
  BBRA-AA3Y
  Note: This code is required to play the Japanese version of the game on a US Genesis console.
• Invinciblity
  RHVA-A612
• Infinite Lives
  RESA-C6VE
• Infinite Bombs
  AJVT-CA58
• Have All Weapons
  H9GT-AACG
• Stage Select
  BLJA-AR8C