Yu-Gi-Oh! Dawn Of Destiny - Platform: XBox

Rare cards:
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When you put in a new name such as "GOD OF CARDS" or "HEARTOFCARDS", you will 
get a rare card such as Tri-Horn Dragon. If you enter "KONAMI" as a game, you 
will get Cosmo Queen. Enter "XBOX" as a game and you will get Zera the Mant.

Use other decks:
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Unlock all tiers in triple duel mode. Then, hold X at the opponent selection 
screen in single duel mode to bring up a a deck selection screen. You may now 
choose anyone's deck. This allows to you see what is in the other character's 
decks and use them against an opponent in single duel mode. Also when at the 
single duel screen, hold X. In order for this to work you must unlock all tiers 
and view the credits at least once.

Alternate background:
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Press X at the menu with the single or triple duel options to change the 
background to that of one of cards that you have unlocked.

Getting higher in triple dueling:
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Getting to the next level is quite easy. If the order is easy, medium, hard, it 
could be a challenge. However, by putting them in hard, medium, easy order you 
can save your life points for an easy person. You should be able to complete it.

Easy magic and trap cards:
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To get easy magic and trap cards, unlock the Rare Hunter in triple duels. Then, 
just keep defeating him until you get the cards that you need. He has all the 
best magic and trap cards required for a deck. Note: He three sets of Exodia and 
multiple limited cards such as Pot Of Greed.

Easy win:
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Get the magic card that stops all trap cards and set it down face up. Then when 
you attack, there are not any trap holes. This is very useful against Grandpa, 
because he mostly has trap hole.

Easy surrender:
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If you are tired of waiting for the match to end when you know that you are 
going to get defeated, select your deck, and click "Surrender" instead of doing 
the hard reset or in-game reset.

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

Getting good cards:
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Kaiba, Yugi, Yami Yugi, and the Rare Hunter will give you good cards when you 
defeat them in single duel mode. You can also get cards from their graveyard if 
you choose the correct statue.