To unlock...               ...you have to: 
Theater mode               Beat arcade mode once. 
Tekken Bowl Juke Box       Get 200 points. 
Gallery mode               Unlock Devil. 
Tekken Bowl mode           Unlock Ogre. 
Gold Tetsujin              Win ten matches in versus mode. 
Heihachi                   Beat arcade mode without losing in less
                           than 5 minutes, 30 seconds. 
Play as Tiger              Highlight Eddy and press Start. 
Play as Angel              Highlight Devil and press Start. 


Bonus characters:
     Beat  arcade  mode  to  unlock one of the bonus characters. A new
character will be unlocked each time (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 

Select practice mode stage:
     Highlight  Practice  Mode,  hold  L2  and  press R2 the following
number of times:

01 - Law 
02 - Yoshimitsu 
03 - Ling 
04 - Hwoarang 
05 - Lei 
06 - Ogre 
07 - School Stage 
08 - Jin 
09 - Nina 
10 - Eddy 
11 - King 
12 - Heihachi 
13 - Eddy 
14 - Unknown 
15 - Law 
16 - School Stage 
17 - Jin 
18 - Nina 
19 - Yoshimitsu 
20 - Paul 

Do Super Charger:
     While playing, press all the buttons and your character will be a
little faster and stronger for a few seconds.

New Outfit for Armor King:
     First  finish the game using Armor King. Then go to the character
selection screen, highlight him and press Start.

Play as the monster behind Unknown:
     In  arcade  mode,  highlight  Unknown,  hold  select,  circle and
triangle,  and press R1, R2 and the same time. Only the monster behind
Unknown should appear during gameplay on the 4th stage.

Be Devil Jin:
     Play  as both Jin and Heihachi in tag mode and press Left, Right,
Square, Triangle, Triangle, and X while playing as Jin.

Ling's Extra Ending:
     Beat  arcade mode with Ling, then beat it again in her schoolgirl
costume. Then you can to view two different endings that she has.

Start Match With Second Character Selected:
     Press  and  hold the Tag Button and press start. Continue holding
the Tag button until the match starts.

"Unknown's" moves:
     When  playing with the secret charcter "unknown," she will switch
what  characters moves she does every time you switch her out and back
in. You can also press R3 to change "unknown's" moves

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.

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.

Play as devil Jin:
     Have  Heihachi  and Jin as partners. Press back then Triangle and
Square  at  the same time (force). After that, red lightning will flow
go  around  his  body. During that press Triangle, Triangle, X (omen).
It's  in Jin's command list under force then omen. It doesn't last for
that long. You can do moves during omen, the command list for Jin will
tell you.