After losing or completing the ladder, the game will prompt you to enter a code. Unlock the following character by entering the corresponding codes. Note: The new characters will be permanently unlocked:
During the match just before the '?' on the match chart, you can fight Jade by doing the following. One of the rounds must be won using only Low Kicks and the D-pad, while the other round can be won normally. Once you meet all those requirements, you will fight Jade at "Goro's Lair".
During a two player game, you can fight Noob Saibot by doing the following. 50 matches must be won in a row. All of those 50 matches must be won in two player mode. Once you meet all these requirements, you will fight Noob Saibot at "Goro's Lair".
While fighting on "The Portal Stage" in a one or two player game, you can fight Smoke by doing the following. Dan Forden must appear at the bottom of the screen and yell "Toasty!". Hold DOWN + START when you see Dan Forden. Once you meet all these requirements, you will fight Smoke at "Goro's Lair". Note: Dan Forden will only appear after an uppercut. His appearance after an uppercut is random.