Yu-Gi-Oh: Dawn of Destiny Cheats

Just push these buttons

In the main menu highlight single or triple duel and press X. The
background will change to an unlocked card

The following is a lost of all the characters you will face in each of the levels in Triple Duel:

Free Rare Cards
To receive the corresponding cards enter the following names:
KONAMI
Cosmo Queen Card
XBOX
Zera the Mant Card
GOD OF CARDS
Tri-Horn Dragon Card
Use Opponent's Decks:
Defeat every opponent in Triple Duel mode and hold X at the opponent
selection screen in Single Duel mode.

Enter your name as the following to get a rare, powerful card in each deck before you start a
game.

KONAMI
Cosmo Queen Card

HEARTOFCARDS
Tri-Horn Dragon Card

XBOX Zera
the Mant Card

To get your desired characters for single dueling, you must put them last and defeat the team.

In the main menu highlight single or triple duel and press X. The background will change to an unlocked card.