Fight Jade:
Win 2 rounds to fight Jade. You have to won one of the round using only
Low Kicks and the Directional Pad. The other round can be won normally. 

Fight Noob Saibot:
Win 50 matches in a row in 2 player mode.

Fight Smoke:
Fight on The Portal Stage in a one or two player mode. Hit an uppercut and 
Dan Forden should appear and yell "Toasty!". Hold Down + Start right 
after you see Dan Forden to fight Smoke .

Notes: Dan Forden appearance after an uppercut is random.

Disable Throwing:
If you are playing in 2 player mode, you have the option of no throws. 
To do this Hold D + HP on both controller before the match begins. 
If the code is activated you will get a "Throwing Disabled" message.

Unlock Pong mini-game:
Play 250 battle in the game. When the 250th battle has begin, you will 
teleport to an another dimension where you can play Pong game. You have 
to earn 7 points to continue the game.