Unlockable: Devil Jin:
To play as Devil Jin, you must complete Tekken: Devil Within mini-game.

Unlockable: Characters:
Anna Williams: Beat Story Mode two times
Baek: Beat Story Mode three times
Bruce Irvin: Beat Story Mode 4 times
Kuma: Beat Story, Battle or Time Attack mode 5 times
Ganryu: Beat Story, Battle or Time Attack mode 6 times
Heihachi: Beat Story, Battle or Time Attack mode 8 times
Mokujin: Beat Story, Battle or Time Attack mode 7 times
Roger Jr.: Beat Story Mode with Kazuya .

Gaining Ranks Quicky:
In order to gain ranks quickly you must play opponents of the same rank as you are, same as it is in the arcade version. When defeating CPU opponents of the same rank as your character it usually only requires 3 to 5 wins to get a promotion.After your fight has ended in Arcade Mode you can select on of 3 opponents with the directional pad, you can't always select an opponent with the same rank but do so when one is available. You;ll have your character rank maxed out in no time.

Kill a Frog:
In the Secret Garden Stage. If you look closly at the ground some where you will notice there is a Frog. If you or your opponent gets knocked in the air and lands on the frog it while die and its angel will float upward.

Getting Expensive Items For Free:
That's right, you can get a bunch of the high priced items for free when you play 'Devil Within' a second time after you have already completed the quest. Various expensive items will be scattered around throughout the game.

Activating Theater Mode:
The Theater Mode gets opened up after you beat Story Mode once with whatever character. At that time you are able to listen to the stage soundtracks, view the movies of the character you just beat Story Mode with and the attract movies (Arcade Intro, PlayStation2 Intro, and E3/TGS trailers). As you beat Story Mode with each character the movies will become available in Theater Mode. Getting all movies requires you the beat Story Mode with both Kuma and Panda as well as Christie and Eddy.

Hidden Story Mode Interludes:
Don't always be quick to defeat the Story Mode interlude opponents, in some cases when you lose you get to see a different movie as part of the story.
Submitted by: deadmaster

Earning Game Money:
You earn money in Arcade Mode, if you play higher ranked CPU opponents you will be rewarded with a higher amount of G after defeating the opponent. The money earned per fight in Arcade Mode ranges from 800G to about 4000G. In Arcade Mode you will also encounter random roulettes which multiply your winnings. The fastest way to get some money in the bank at first is to unlock the endingd for all characters by completing Story Mode with everybody. This gets you 100,000G per character for the first time through only.You can also collect money while playing 'Devil Within' and are rewarded an extra 100,000G upon completing the quest.