The following are known GameShark / Action Replay Codes for Mega Man 8 on SEGA Saturn.

• Master Code
  f6000914c305
  b60028000000
• Have Mega Ball
  160361e40100
• Infinite Mega Balls
  160361e62800
• Have Flash Bomb
  160361e80100
• Infinite Flash Bombs
  160361ea2800
• Have Thunder Claw
  160361ec0100
• Infinite Thunder Claws
  160361ee2800
• Have Astro Crush
  16036204 0100
• Infinite Astro Crush
  16036206 2800
• Have Flame Sword
  160361fc0100
• Have Homing Sniper
  16036200 0100
• Have Ice Wave
  160361f00100
• Have Tornado Hold
  160361f40100
• Have Water Balloon
  160361f80100
• Infinite Flame Sword
  160361fe2800
• Infinite Homing Snipers
  16036202 2800
• Infinite Ice Waves
  160361f22800
• Infinite Tornado Hold
  160361f62800
• Infinite Water Balloons
  160361fa2800
• Invincibility
  16030006 0053
• Infinite Bolts
  1602DADC 0063
• Infinite Rush Power
  1602DAAC 2800