Duel Masters: Cobalt Cheats - PlayStation 2

Win duel
Hold [R3] and press [L1], [R1], [L1] to give player one the win. Hold [R3] and press [R1], [L1], [R1] to give player two the win.

Additional locations
Hold [R3] and press [Circle]x3 at the map screen.

Additional cards
Hold [R3] and press [L1]x3 at the deck building screen. You will get four of each card.

Play as Chuck
Hold [R3] and press [L1]x3 at the deck building screen to unlock Chuck in arcade mode.

Play as Shobu
Select versus mode and let player two choose a character. Then, have player one press [R2]x2, [L1], [R2], [X].

Cards do not run out in duel
Hold [R3] and press [Square]x3.

Remove shield
Hold [R3] and press [Triangle], [Square], [X] to remove one of player one's shields. Hold [R3] and press [Triangle], [Circle], [X] to remove one of player two's shields.

Add shield
Hold [R3] and press [X], [Square], [Triangle] to add one shield for player one. Hold [R3] and press [X], [Circle], [Triangle] to add one shield for player two.

Caitlan
To get Caitlan, complete Rusty's story.

Earl
To get Earl, complete Trey's story.

Jalen
To get Jalen, complete Rebecca's story.

Knight
To get Knight, complete everyone's story.

Marcus
To get Marcus, complete Flynn's story.

Monks
To get the monks, you must defeat them the first time.

Sera
To get Sera, complete Luc's story.

Widow
To get the Widow, defeat her at the end of the tournament.