The following are known Game Genie Codes for The Lion King on SEGA Game Gear.

Lion Prince Difficulty Codes
• Start With 1 Life
  017 B98 E66
• Start With 5 Lives
  057 B98 E66
• Start With 9 Lives
  097 B98 E66
• Start With 1/2 Of A Circle of Life
  027 BB8 C4A
• Start With 1 Circle of Life
  047 BB8 C4A
• Start With No Circles of Life
  007 BB8 C4A

Any Difficulty Codes

• Get Hit & Become Invisible
  3A6 439 2A2
• Flash Less After Getting Hit
  0F6 639 7FB
• Flash Longer After Getting Hit
  FF6 639 7FB
• Ladybugs Do Not Restore Any Energy
  3A9 9E9 2A2
• Infinite Lives
  3A6 88C 2A2
• Invisibility
  3E5 B5A 4CA
• Invincibility
  3E7 73B 7F4
  3D7 76B A27
  327 77B 082