Cheat menu
Enter the options screen and highlight the "Continues" selection. Then, hold Block + Run until the word "Outstanding" is spoken and the cheat menu appears. Now the following cheat options will be available. Note: Only one of the following cheat options can be used at a time.

Endings
Enable the "Endings" option on the cheat menu. Then to see a character's ending, start a game in arcade mode and defeat just one character.

Fatalities 1
Enable the "Fatalities 1" option on the cheat menu. Then to finish your opponent, hold Down and press High Punch. This will let any character perform their first fatality.

Fatalities 2
Enable the "Fatalities 2" option on the cheat menu. Then to finish your opponent, hold Down and press High Punch. This will let any character perform their second fatality.

Level Fatalities
Enable the "Level Fatalities" option on the cheat menu. Then to finish your opponent, hold Down and press High Punch. This will let any character perform their level fatality.

Play as Meat
Enter "Group Mode" and beat the game with all sixteen characters. After this has been accomplished, select any character and begin a match. Then your character will play as Meat with all the moves of the character that was selected.

Play as Goro
Beat the game with Shinnok and save the game. Enable the "Cheat menu" code. Then, select the "Invisible" icon at the bottom of the character selection screen. Press Up(3), Left to highlight Shinnok's icon, then press Run + Block (C-Left + C-Down by default).

Alternatively, beat the game with Shinnok and save the game. Enable the "Cheat menu" code. Then, select the "Invisible" icon at the bottom of the character selection screen and hold C-Down. Press Up(3), Left, and hold C-Left until "Choose Your Destiny" is heard.

Play as Noob Saibot
Beat the game with Reiko and save the game. Then, enable the "Cheat menu" code. Then, select the "Invisible" icon at the bottom of the character selection screen. Press Up(2), Left to highlight Reiko's icon, then press Run + Block (C-Left + C-Down by default).

Alternatively, beat the game with Shinnok and save the game. Enable the "Cheat menu" code. Then, select the "Invisible" icon at the bottom of the character selection screen and hold C-Down. Press Up(2), Left, and hold C-Left until "Choose Your Destiny" is heard.

New weapon
Beat the game with Kai. Then, start a new game with Kai and his weapon will be Raiden's lighting staff.

Alternate costumes
At the character selection screen, highlight a fighter, hold Block and press any button two times to rotate their select screen picture and enable their second costume, except for Sonya and Tanya. The select screen pictures must be rotated three times for those characters. Rotate any other characters picture three times to enable their third costume.

Alternate weapons
Enable a character's third costume to fight with their alternate weapon.