Anilrgowda

Fight As Angel
Beat the Arcade Mode until Devil becomes unlcoked. At the Character select screen, highlight his screen and press Start.

Fight As Tiger
At the Character select screen, highlight Eddy"s screen and press Start.

Gallery Mode
Unlock Devil to access the gallery mode.

Jukebox
You can unlock the Jukebox by bowling a score higher than 200 points during a game. Once you"ve done that you can hit start and access the bowling menu. Now, choose Bowling Options and choose your song.

Knockout Dr. B
In Tekken Bowl, if you aim at Dr. B. in the background you can hit him and get a K.O.
submitted by bard

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