The following are known Game Genie Codes for Mortal Kombat on Nintendo Game Boy.

• 00C-B5E-3BE
  Infinite time
• 005-94C-B31
  Player 1 is invincible
• 109-C7C-E6F
  Foot sweep does less damage
• FF9-C7C-E6F
  Foot sweep does more damage
• 010-14B-F72
  Start with 1 continue
• 050-14B-F72
  Start with 5 continues
• 0A0-14B-F72
  Start with 10 continues
• 002-96D-B31
  Infinite continues
• 109-AFC-6EE
  Punches do less damage
• FF9-AFC-6EE
  Punches do more damage
• 109-BFC-E6F
  Knees do less damage
• FF9-BFC-E6F
  Knees do more damage
• 109-A7C-E60
  Uppercuts do less damage
• FF9-A7C-E60
  Uppercuts do more damage
• 109-CFC-E6F
  Kicks to stomach do less damage
• FF9-CFC-E6F
  Kicks to stomach do more damage
• 109-B7C-6E3
  Kicks to face do less damage
• FF9-B7C-6E3
  Kicks to face do more damage
• 10A-17C-E6F
  Shoulder throws do less damage
• FFA-17C-E6F
  Shoulder throws do more damage
• 10A-07C-A2F
  Sub-Zero’s slide does less damage
• FFA-07C-A2F
  Sub-Zero’s slide does more damage
• 10A-27C-6EF
  Sonya’s leg grab does less damage
• FFA-27C-6EF
  Sonya’s leg grab does more damage
• 10A-1FC-6EF
  Kano’s cannonball does less damage
• FFA-1FC-6EF
  Kano’s cannonball does more damage
• 10A-5FC-7F5
  Rayden’s lightning does less damage
• FFA-5FC-7F5
  Rayden’s lightning does more damage