At the character select screen, quickly press Left, Up, Right, Down, Left, Select. If you did it right you'll hear a gong sound.
At the Game Start screen, hold L + R and press Start. A 4x4 match should begin. Note that this is for two players only, and the computer will not participate.
This tricks works on the "Dead Pool" stage (the one with the green acid in the background.)
When the screen says "Finish Him!", hold Low Punch + Low Kick, press and hold Down, then press High Punch. If you did it right you'll send your opponent into the acid.
Choose Your Fights
To fight any of the characters below, enter the indicated code on the Character Select screen.
|Jade||Up, Down, Down, Left, Right|
|Noob Saibot||Left, Up, Down, Down, Right|
|Kintaro||Up, Down, Down, Right, Right|
|Shao Kahn||Right, Up, Up, Right, Left|
Different Dead Pool Fatality
This is a weird bug (I think it's a bug) that you do with Sub-Zero at the dead pool. Beat up your opponent until it says FINISH HIM/HER and then do the first part of the Deep Freeze (F, F, D, HK). This should turn your opponent into a big thing of Ice. Now, instead of doing the uppercut that would shatter them (F, D, F, F, HP) do the stage fatality (hold LP and LK then do a regular uppercut) Now, instead of the regular body going into the dead pool, the chunk of ice will.
Double Fatality Time
Need more time to enter the Fatality codes? At the Character Select screen, press Up, Up, Left, Up, Down + Select.
To fight Jade, work your way to the match before the mystery fight (the one titled "?"). During this battle, defeat your opponent using nothing but low kicks. If you manage this feat you'll fight Jade in the next battle.
Fight Noob Saibot
To fight Noob Saibot, get 50 wins in a row.
To fight Smoke, press DOWN + START on the Bridge stage when Dan says "Toasty!"
Green Ball Trick
Note: These codes don't have to be done in two-player mode, but it is extremely hard to do them against the computer, so just fight against yourself.
Play as Shao Khan
To play as Shao Khan go to the Options menu and put the Handicap at max then at the player select choose Sub-Zero but press the B-button twice.
For a different introduction, hold L + R while your turn on the Super Nintendo.
Super Damage and Defense
To defeat any opponent in two hits, press Down, Up, Right, Up, Left + Select at the Character Select screen. This code will also cut the damage done to you by half.
Warp to Jade
At the character select screen, press Up, Down, Down, Left, Right + Select.
Warp to Smoke
Press Up, Left, Up, Up, Right + Select on the Character Select screen.