The following are known Game Genie Codes for Mortal Kombat on SEGA Game Gear.

• Each Round Is 69 Seconds
  063 7B4 C4E
• Each Round Is 29 Seconds
  023 7B4 C4E
• Infinite Time
  00B 40C 3BE
• Infinite Credits
  004 2D6 19E
• Blood
  DEB 9F6 5D3
• Player 1 Is Invincible
  003 48B F79
• Player 1 Starts With 1/2 Health
  240 BFD C4B
• Player 2 Usually Starts With 1/2 Health
  240 C5D C4B
• Punches Do More Damage
  20B 06F F7A
• Most Kicks Do More Damage
  2CB 26F C42
• Foot Sweeps Do More Damage
  30B 86F C42
• Flying Punches Do More Damage
  30B 2EF D5A
• Uppercuts Do More Damage
  33B 56F A2E
• Throws Do More Damage
  2AF 237 D5A
• Sonya Blade’s Leg-Grab Does More Damage
  2BB 76F F7A
• Scorpion’s Harpoon Does More Damage
  2BB 66F F7A
• Rayden’s Flying Thunderbolt Does More Damage
  2BB 6EF F7A
• Johhny Cage’s Shadow Kick Does More Damage
  2BB 4EF D56
• Some Other Special Moves Do More Damage
  37B 36F D52
• Start On Match 2
  01B C9A E6A
• Start On Match 3
  02B C9A E6A
• Start On Match 4
  03B C9A E6A
• Start On Match 5
  04B C9A E6A
• Start On Mirror Match
  05B C9A E6A
• Start On Endurance Match 1
  06B C9A E6A
• Start On Endurance Match 2
  07B C9A E6A
• Start On Endurance Match 3
  08B C9A E6A
• Start On Match Against Goro
  09B C9A E6A
• Start On Match Against Shang Tsung
  0AB C9A E6A
• Start With 1 Credit
  02B E1A F76
• Start With 5 Credits
  06B E1A F76
• Start With 10 Credits
  0BB E1A F76