Codes:
At the main menu press Up, Up, Down, Down, Left, Right, A, B, A. - Kool Stuff

At the main menu, press SELECT, A, B, Right, Left, Down, Down, Up, Up - Kooler Stuff

At the main menu, press X, B, A, Y, Up, Left, Down, Right, Down - Scott's Stuff

At the main menu, press A, Y, B, X - Sound Test

At the main menu, highlight the word ''start'' hold the L and R buttons on the controller and press START - Tournament mode

Play As Smoke:
At the copyright screen, hold Left and A. When the Williams logo appears, release the buttons and hold Right and B. When the words ''There is no knowledge that is not power'' appear, release the buttons and hold X and Y Continue to hold the buttons until the MK3 logo appears. Smoke will walk onto the screen and Shao Kahn will say ''Outstanding'' when you entered the code correctly.

Kombat Codes:
688688 - Dark Kombat
033000 - Player 1 half energy
000033 - Player 2 half energy
642468 - Play Galaga
091293 - Sweeps Disabled
666444 ????? 466466 - Unlimited Run
985125 - Psycho Kombat
460460 - Randper Kombat
987123 - No Life Bar
100100 - Throws Disabled
020020 - Blocks Disabled
707000 - Player 1 Quarter Energy
000707 - Player 2 Quarter Energy
205205 - Fight Smoke
769342 - Fight Noob Saibot
969141 - Fight Motaro
033564 - Fight Shao Kahn
449449 - Invisible Players
123926 - No Knowledge

Random select:
At the character select screen go to Shang Tsung if you are first player and press Up + Start. If you are second player, do this on Lui Kang instead of Shang Tsung.