The following are known Game Genie Codes for Atomic Runner on SEGA Genesis.

• Your Character Is Invincible And Never Stumbles Over
  A2YA-AA8N
  Note: You cannot get items while this is enabled.
• Your Character Does Not Stumble Over
  RYYT-A6TG
• Invincible Against Non-Burning Attacks
  RYYT-A6TJ
• Invincible Against Burning Attacks
  RYYT-A6TN
• Don’t Change Y Coordinate
  REZT-A60J
• Almost Invincible
  RYYT-A6ZW
• You Cannot Fall Down Into Pits
  6JXT-ACAC
• You Cannot Be Damaged By Walls
  D21T-AA50