Unlimited continues:
Press Up, Up, Toward, Toward, Away, Away, Down, Down while the game loads. Shao Khan say "Excellent" to confirm correct code entry.

Question mark menu:
Press HP, LP, LK, HK, Block, Block, Run, Run, Block, Block when the story introduction is displayed. The phrase "You will never win" will be spoken to confirm correct code entry. Press [Up] when the Mortal Kombat 3 logo and cube appears to display the question mark option.

Cheat mode
Start the game by using one of the following command line parameters : Note: Multiple codes may be entered at once.

Result - Parameter:

Short fighters - 54321
Very thin fighters - 1111
Fat fighters - 8888
Tall fighters - 12345
Shadow fighters - 831
Invisible combatants - 1995
Turbo mode - 8000
Slow mode - 603015
Backwards Kombat - 9966
Block causes 99% damage - 4862222
Temporarily enable Smoke, with normal CPU - 666
Temporarily enable Smoke, with hard CPU - 0666
Temporarily enable Bosses in 2-player mode - 1000000
Disables blood and fatalities - noblood
Enables blood fatalities - blood
Disables fatalities - noviolence
Enables fatalities - violence

Ultimate Kombat Kodes:
Perform a clockwise sweep of the controller to display the Ultimate Kombat Kodes screen. The icons on the bottom of the VS screen can be changed by pressing the HP, HK, and LK in that order. Player one selects the first three codes and player two controls the last three. When icons are placed in a certain combination, a Kombat Kode is revealed. Then ten possible icons and number of button presses are:

0: Dragon
1: MK
2: Ying Yang
3: 3 Symbol
4: Question Mark
5: Lightning Bolt
6: Goro
7: Raiden
8: S. Khan
9: Skull

Result: Kombat Kode:

No throws: 100-100
No blocking: 020-020
No power bars: 987-123
Half energy for player 1: 033-000
Half energy for player 2: 000-033
1/4 energy for player 1: 707-000
1/4 energy for player 2: 000-707
Fight as Smoke: 010-696
Dark fighting: 688-422
Random morphing: 460-460
Unlimited run: 466-466
Galaga: 642-468
No Fear: 282-282
There is No knowledge that is not power: 123-926
Holds flippers during casino run: 987-666
Winner fights Motaro: 969-141
Winner fights Noob Saibot: 769-342
Winner fights Shao Kahn: 033-564
Winner fights Smoke: 205-205
Player 1 heals after each hit: 101-000
Player 2 heals up after each hit: 000-101