Successfully complete arcade mode with Armor King. Then at the character selection screen, highlight Armor King and press Start.
Automatic lower parry
While fighting with any character, press Down/Forward to do a lower parry.
Bonus characters
Successfully 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 the following 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.
Easy Bowling
In Tekken Bowl, choose Yoshimitsu and Bryan Fury. They both have the "lock on" aiming and are easier to control than Gun Jack, Jack-2, and Prototype Jack.
Escape backflip
While fighting with most characters, press Up/Back to do an escape backflip.
Gallery mode
Unlock Devil to access Gallery mode.
Juke Box in Tekken Bowl mode
Get 200 points in Tekken Bowl mode.
Ling FMV sequences
Successfully complete arcade mode with Ling, then complete it again in her school costume to view two different FMV sequences featuring Ling.
Play as Angel
At the character selection screen, highlight Devil and press Start.
Play as Devil Jin
Note: Jin and Heihachi must be partners. While playing as Jin, press Back, Right, Square, Triangle(2), X.
Play as Doctor Boskonovitch
Get the top score in Tekken Bowl mode.
Play as Gold Tetsujin
Win ten matches in versus mode.
Play as Heihachi
Successfully complete arcade mode without losing in less than 5 minutes, 30 seconds.
Play as Tiger
At the character selection screen, highlight Eddy and press Start.
Quick way to beat computer in arcade mode
Here is a nifty little tip for all those gamers out there having a hard time beating the computer, first off this trick really only works on normal and a difficulty above that. First pick Paul Phoenix, when the match starts all you need to do is land a jump kick (forward + left kick) then as they are in the air descending to a left jab (left punch) and immidiatly after that do Pauls power punch (back + left punch and right punch simultanously) and the computer will roll and stand up right into it! Walla 1 round won! P.S. sometimes it doesnt kill them, so after it hits them just double tap forwards to run towards them and when you get close enough hit right kick to slide.
Secret video
When you are just finishing arcade mode, you will see a video of that player. You must lose the first match without harming the boss. Then you win the next two, killing the boss. Then quickly hold down all buttons and it will show a secret video never been seen before of the person you used to beat it with.
Start Match With Second Character
Hold Tag and press Start. Continue holding the "Tag" Button until the match starts.
Start match with second character selected
Hold Tag and press Start.
Super charger
While fighting with any character, press all buttons to do a super charger.
Tekken Bowl mode
Unlock Ogre to access Tekken Bowl mode.
Theater mode
Successfully complete the game once to unlock Theater mode.
Transform Kazuya into Devil or the other way around
First choose kazuya and devil as tag partners. When one tags in the other they will simply transform instead of leaving the screen.
Unknown Endings
To see the endings for Unknown, Mojukin, and Tetsujin's ending, you must play as them through Arcade Mode. To choose them in Arcade Mode you must use the Random Icon (?) until one of them are selected. They must be the fist person you choose so use the select button if you didn't get them the first time.
Unknown, Tetsujin and Mojukin
To get Unknown,Mojukin,and Tetsujin instead of picking them through the Random Icon there is a invisible square were you can get them. You have to go into arcade mode, go down near Wang and go and press < to get Mojukin & Tetsujin. Press < to get Unknown.