The following are known Game Genie Codes for Ultimate Mortal Kombat 3 on SEGA Genesis.

• Access “Dragon Box” (In Middle of Select Screen) From The Left
  BMTA-AWBA
• Access “Dragon Box” (In Middle of Select Screen) From The Right
  BMTA-AWB4
• Access “Dragon Box” (In Middle of Select Screen) From The Bottom
  BSTA-AYC2
• Access “Dragon Box” (In Middle of Select Screen) From The Top
  BMTA-AWDC
• Force “Dragon Box” To Contain Human Smoke
  C5ST-AAG6
  Note: Bosses will not be accessible.
• Force “Dragon Box” To Contain Chameleon
  DHST-AAG6
  Note: Bosses will not be accessible. Chameleon is not complete and will not be like a normal opponent.
• Infinite Energy P1
  ALDA-JA90
• Infinite Run P1
  AL0T-CA8W
• Infinite Time
  AJAA-CA4J
  Note: The timer will look like it is decreasing but you will have an infinite amount of time.
• Infinite Run P2
  AL0T-CA9J
• Mileena Will Eat All of The Nails When You Do Fatality 2
  AWWA-JATL
• Two Hit Kills For Sub-Zero And Classic Sub-Zero Ice Blast
  AK8A-JA4Y
• Night Wolf Turns To Ice When He Does His Fatality 1
  AXRA-JA1N
• Kung Lao Doesn’t Stop Sppining When He Does Fatality 1
  ASEA-JA53
• Shang Tsung Dies When He Does Fatality 1
  A09T-JAV6
• Jade Doesn’t Stop Shaking Anyone On Fatality 2
  AGVA-JASW
• Win 2 Rounds And You Will Finish The Game
  REXA-C6Z2
  Note: This code works in 1-Player Mode Only. If you want to see the fatality you will need to disable this code.
• Hide Character Sprites On Select Screen
  AHLA-BGLE
• Infinite Energy P2
  AWDT-JA2T
• Cheat Menus Enabled
  ADJT-LAFL
  ADJA-LCAA
• Infinite Time (Alternate)
  ATAA-CA2T
• Infinite Fatality Time
  REYT-C6Z6
• Player 1 Tales No Damage
  BCDA-JA9Y
• Player 1 Takes All Damage
  C4DT-JA2N
• Player 2 Takes All Damage
  RGDT-J6TN
• Human Player Automatically Does Fatality 1, If Character Has It
  ELCA-EN5L
  JVXA-CA4J
• Human Player Automatically Does Fatality 2, If Character Has It
  ELCA-EN5L
  RFXA-C6WJ
• Human Player Automatically Does Stage Fatality On The Proper Stages
  B4CA-EJ5L
• Human Player Automatically Does Friendship
  DWCA-EN5L
• Human Player Automatically Does Babality
  6LCA-EJ5L
• Human Player Automatically Does Babality (Fast)
  BCCA-EL5L
• Human Player Automatically Does Brutality
  GCCA-EL5L
  RE0A-E610
• Press Just X Instead of Long Combination, And You’ll Do Brutality
  RE0A-E610
• Press B Button To Make Fatality 1
  9G2T-C6ZT
  AW2T-CAFW
  XW2T-D7FY
• Press B Button To Make Fatality 2
  9G2T-C6ZT
  AW2T-CAFW
  042T-D7FY
• Press B Button To Make Stage Fatality 1
  9G2T-C6ZT
  AW2T-CAFW
  C42T-C57Y
• Press B Button To Make Friendship
  9G2T-C6ZT
  AW2T-CAFW
  6L2T-CVFY
• Left Player Can Hit Anywhere
  ALCT-JA7A
• Right Player Can Hit Anywhere
  ALCT-JA78
• Player 2 Takes All Damage
  RGCT-J61Y