The following are known Game Genie Codes for Earthworm Jim on SEGA Game Gear.

• Start With 1/4 Energy
  194-D86-7FB
• Start With 1/2 Energy
  324-D86-7FB
• Start With 3/4 Energy
  4B4-D86-7FB
• Start With 3000 Bullets
  B84-DD6-4C9
  8B4-E26-E66
• Start With 4000 Bullets
  AO4-DD6-4C9
  8C4-E26-E66
• Start With 5000 Bullets
  884-DD6-4C9
  904-E26-E66
• Start With 6000 Bullets
  704-DD6-4C9
  944-E26-E66
• Start With MEGA Ammo
  FF4-DD6-4C9
  FF4-E26-E66
• Infinite Lives
  3A4-0EC-2A2
• Infinite Energy
  3A3-B4C-2A2
• Infinite Gun
  3A5-53A-2A2
• Flash Longer When Hit On The Ground
  885-7C9-A2A
• Don’t Flash At All When Hit On The Ground
  885-7C9-A2A
• One Hit & You’re Invincible
  3AE-01F-2A2
• Invincible
  18D-EAF-6EA
• Gun Pick-Ups Worth Nothing
  002-5CC-C49
• Gun Pick-Ups Worth 1
  012-5CC-C49
• Gun Pick-Ups Worth 25
  192-5CC-C49
• Gun Pick-Ups Worth 50
  322-5CC-C49
• Gun Pick-Ups Worth A Lot
  FF2-5CC-C49
• Energy Pick-Ups Worth Nothing
  002-3BC-B3A
• Energy Pick-Ups Worth 1
  012-3BC-B3A
• Energy Pick-Ups Worth 25
  192-3BC-B3A
• Energy Pick-Ups Worth 50
  322-3BC-B3A
• Energy Pick-Ups Worth A Lot
  FF2-3BC-B3A