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

• Invincibility
  RHVA-A6WR
• Infinite Lives
  RERT-C6X4
• Start With 5 Lives
  AYCT-AAH4
• Start With 10 Lives
  BJCT-AAH4
• Start With 25 Lives
  DECT-AAH4
• Start With 50 Lives
  GJCT-AAH4
• Start With 99 Lives
  NNCT-AAH4
• Infinite Continues
  AMCT-AA4T
• No Continues
  ADAA-AAG6
• Start With All Weapons
  H9GA-AAE6
• You Don’t Lose A Weapon When You Die
  AM4A-AA8C
• Each Bomb Found Is Worth 99 Bombs
  RFTT-C614
• Infinite Bombs On Pick-Up
  AJVA-CA8Y
• Super High Jump
  ADXT-A60L
• Ray and Sheena Have Double Jump
  AHYA-AACT
• Enables Level Select
  BLJA-AA86
• Enables “Slow Motion” Cheat
  BACT-AN2C
  Note: Pause the game and keep pressing Up on the second controller to play in slow motion. If you press C on the second controller, the “PAUSE” in the middle of the screen will vanish.