Cheat Codes
     Just  like in previous Tag Force games for the PSP, the code that
unlocks  the Midday Constellation Booster Pack in the store. Go to the
store and talk to the cashier, when she asks you, if you would like to
shop  around,  say yes. When you come up to the booster pack menu, you
enter the cheat there.

[Up], [Up], [Down], [Down], [Left], [Right], [Left], [Right], [X], [Circle]

Unlockable Characters

Jaden (s3): Beat The Game With Jaden (s4) 

Syrus (Ra Yallow): Beat The Game With Syrus (Obelisk Blue) 

Syrus (Slifer Red): Beat The Game With Syrus (Obelisk Blue) 

Trueman: Beat The Game With Jaden (s4) 

Yubel: Beat The Game With Jaden (s4)

Unlock Obelisk The Tormentor, Slifer The Sky Dragon 
and The Winged Dragon Of Ra
You must perform a UMD recognition with both Tag Force 1 and 2 
to get all 3.

Obelisk The Tormentor: 
Perform UMD Recognition With Yu-Gi-Oh Duel Monsters GX Tag Force 1

Slifer The Sky Dragon: 
Perform UMD Recognition With Yu-Gi-Oh Duel Monsters GX Tag Force 2

The Winged Dragon Of Ra: 
Perform UMD Recognition With Yu-Gi-Oh Duel Monsters GX Tag Force 2