Tekken Bowl Jukebox:
Get 200 points in Bowl Mode.

Unlock Gold Tetsujin:
Win 10 matches in versus mode.

Unlock 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.

Play as Gon: [Submitted by:Salman Khan]
In arcade mode screen, Highlight Heihachi
The Press up, up, down , down,x and beat him on Stage 5 The in Vs Mode Press x As Highlighting Heihachi.
And Gon Will be there For You........

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

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 game play on the 4th stage.

Unlock 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.

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

Gallery Mode
Unlock Devil to access the gallery mode.

Tekken Bowl Mode
Unlock Ogre to access Tekken Bowl Mode.

Theater Mode
Beat the game one time to unlock the Theater Mode.

Unlock Doctor Boskonovitch
Get the top score in Tekken Bowl mode.

Secret Characters
Beat the game to unlock each secret character, which are opened in this order:

Kunimitsu
Bruce Irvin
Jack-2
Lee Chaolan
Wang Jinrey
Roger and Alex
Kuma and Panda
Kazuya Mishima
Ogre
True Ogre
Prototype Jack
Mokujin and Tetsujin
Devil and Angel
Unknown.

To get Dr. Boskonovitch: [Submitted by:jude Emohare]
get the highest rank in tekken bowl. Using any of the following characters makes this easier:- unknown, brian, yoshimitsu.
Alternatively, you could hit dr.B on the left of screen 10 times in a row, then yu get him.

HINT [Submitted by:EMMETT THE CHEAT KING ]
IN TEKKEN BOWL MODE, GET THE SLOWEST GUYS LIKE ALEX, TO UNLOCK ALEX, HIGHLIGHT ROGER AND PRESS X, USE ALEX AND K.O THE CROWD BY GOING THE LEFT OR RIGHTEST AND THE SLOWEST AND IF YOU K.O SOMEONE YOUR NEXT TRY THEY WON'T BE THERE!!!