Go to the Options Menu, and select Continue Options, and hold Block & Run for about 10 seconds (Left C and Down C are the default buttons for Run and Block in Mortal Kombat 4). You can now access the Cheat Options Menu.
Automatic Fatalities
Turn on Automatic Fatalities in the Cheat Menu, then while playing hold Down and press High Punch from anywhere to do an Automatic Fatality get close to the other fighter to do the Pit Fatalities.
Play as Noob Saibot
Select the Hidden Button with A on the character select screen, then move up two, left one to Reiko, and press Run & Block.
Change Character Colors and Weapons
At the character select screen hold Start and press any button this will change everyones outfit. There are up to 4 different choices of clothes & weapons per character.
Play As Goro
Select the Hidden Button with A on the character select screen, then move up three, left one to Shinnok, and press Run & Block.
Kombat Codes
Enter the codes at the 2 player Vs. Screen when the 2 character pictures are facing each other. There are two three digit numbers at the bottom. The first three are for Controller 1 The second three are for Controller 2 The numbers correspond to the number of times you press: Low Punch for the 1st number Block for the 2nd number Low Kick for the 3rd number