Midday Constellation Booster Pack:
To unlock the Midday Constellation Booster Pack, go to the store, and talk to the cashier. Answer “Yes” when she asks if you would like to shop around. When the booster pack menu appears, press Up(2), Down(2), Left, Right, Left, Right, X, Circle.

Unlockable characters:
Unlock the following characters by performing the corresponding tasks:

Adrian Gecko – Beat Story mode with Jaden Yuki.
Aster Phoenix – Beat Story mode with Zane Truesdale.
Atticus Rhodes – Beat Story mode with Zane Truesdale.
Axel Brodie – Beat Story mode with Zane Truesdale.
Bastion Misawa – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force or Yu-Gi-Oh! GX Tag Force 2.
Camula – Beat Story mode with Zane Truesdale.
Chumley Huffington – Beat Story mode with Kagemaru.
Damon – Beat Story mode with Zane Truesdale.
Dark Magician Girl and Sadie – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force two times.
Fonda Fontaine – Beat Story mode with Zane Truesdale.
Fujiwara – Defeat Fujiwara ten times in Free Duel mode.
Jaden (S3) – Beat Story mode with Jaden (S4).
Jasmine – Beat Story mode with Zane Truesdale.
Jesse Andersen – Beat Story mode with Zane Truesdale.
Jim Crocodile Cook – Beat Story mode with Zane Truesdale.
Jinzo – Beat Story mode with Zane Truesdale.
Kagemaru – Beat Story mode with Blair (Silfer Red).
Mindy – Beat Story mode with Zane Truesdale.
Nightshroud – Beat Story mode with Zane Truesdale after defeating Nightshroud.
Normal duelists (Dean, Loggy, Swin, Kami, etc.) – Beat Story mode.
Obelisk Blue Blair and Season 1 Blair – Beat Story mode with Blair Slifer (red).
Obelisk Blue Chazz Princeton – Beat Story mode with Chazz (black uniform).
Paradox Brother (Dox) – Beat the game with Mindy.
Paradox Brother (Para) – Beat the game with Yasmine.
Professor Banner – Beat Story mode with Kagemaru.
Sartorius – Beat Story mode with Blair (Silfer Red).
Syrus (Ra Yellow) – Beat Story mode with Syrus (Obelisk Blue).
Syrus (Slifer Red) – Beat Story mode with Syrus (Obelisk Blue).
Titan – Beat Story mode with Zane Truesdale.
Trueman – Beat Story mode with Jaden (S4).
Tyranno Hassleberry – Beat Story mode with Zane Truesdale.
Vellian Crowler – Beat Story mode with Zane Truesdale.
Yubel – Beat Story mode with Jaden (S4).

Bonus cards:
Unlock the following cards by performing the corresponding tasks:

Dark Bribe – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force 2.
Obelisk The Tormentor – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force.
Plasma Warrior Eitom – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force 2.
Slifer The Sky Dragon – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force 2.
Versago the Destroyer – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force 2.
The Winged Dragon Of Ra – Select the “UMD Recognition” option with Yu-Gi-Oh! GX Tag Force 2.?