Tekken Bowl Mode
Unlock Ogre to get Tekken Bowl (get 200 points and you can unlock the Jukebox)
Successfully complete arcade mode to unlock the theater mode
Simply unlock Devil, and that will get you gallery mode
Complete arcade mode with any character to unlock one of the hidden characters. Another character will be unlocked each time the game is completed, in this order: Kunimitsu, Bruce Irvin, Jack-2, Lee Chaolan, Wang Jinrey, Roger & Alex, Kuma & Panda, Kazuya Mishima, Ogre, True Ogre, Prototype Jack, Mokujin & Tetsujin, Devil & Angel, and Unknown.
Play as Angel
At the character selection screen, put the selector on Devil and press Start.
Play as Tiger
At the character selection screen, put the selector on Eddy and press Start.
Play as Heihachi
Complete Arcade mode without losing in 5 minutes and 30 seconds..
Play as Gold Tetsujin
Win ten fights in Versus mode.
Play as Devil Jin
Have Jin and Heihachi as your team, while playing as Jin, press Back, Right, Square, Triangle(2), X.
Armor King's alternate costume
Complete Arcade mode with Armor King. Then at the character selection screen, put the selector on Armor King and press Start.
Ling's FMV sequences
Complete arcade mode with Ling, then beat it again in her school costume to view two different FMV's featuring Ling.
While fighting (anywhere and with anyone), press all the buttons to do a super charger.
Automatic lower parry
While fighting (anywhere and with anyone), press Down/Forward to do a lower parry.
While fighting with most characters, press Up/Back to do an escape backflip.