Yu-Gi-Oh Dawn of Destiny Cheats

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

Use other decks:
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.
User Cheat by Colvin43

Alternate background:
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:
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.

Recommended cards:
The best cards in the game are Blue Eyes, Exodia, and power ups.
User Cheat by WWJD IHWG

God cards:
There are no Egyptian cards in this game . Konami have said that they were not included because the cards are not tournament legal.

How to beat Rex Raptor:
He will fusion summon any Dinosaur monster. Use Magic Jammer or something else to wipe out his monsters.

How to beat Shimon:
He is not that experienced and uses weak monsters. Use a 1900 Attack monster to win.
User Cheat by 51cent

How to beat Strings:
Do not worryl he does not have Slipher in his Deck. However he will try to get some powerful monsters on the field.

How to beat Tea:
Hust sit back and destroy the fairies.
User Cheat by 2Dolla

Unlocking characters in single duel mode:

Shimon: By beating level 1 in Triple Duel.
Grandpa: By beating level 1 in Triple Duel twice.
Yugi: By beating level 6 or defeat level 1 in Triple Duel three times.
Tea: By beating level 2 in Triple Duel.
Joey: By beating level 10 or defeat level 2 in Triple Duel twice.
Tristan: By beating level 2 in Triple Duel three times.
Bakura: By beating level 3 in Triple Duel three times.
Shadi: By beating level 3 in Triple Duel.
Yami Yugi: By beating level 14, level 12 or level 3 in Triple Duel twice.
Weevil: By beating level 4 in Triple Duel twice.
Rex Raptor: By beating level 4 in Triple Duel.
Mako: By beating level 4 in Triple Duel three times.
Bonz: By beating level 5 in Triple Duel twice.
Bandit Keith: By beating level 5 in Triple Duel three times.
Pegasus: By beating level 5 in Triple Duel.
Mai: By beating level 10 or level 6 in Triple Duel.
Kaiba: By beating level 12 or level 6 in Triple Duel three times.
Rare Hunter: By beating level 13 or level 7 in Triple Duel.
Arkana: By beating level 7 twice in Triple Duel.
Strings: By beating level 7 in Triple Duel three times.
Espa Roba: By beating level 8 in Triple Duel twice.
Lumis and Umbra: By beating level 8 in Triple Duel three times.
Marik: By beating level 10 or level 8 in Triple Duel.
Ishizu: By beating level 11 or level 9 in Triple Duel twice.
Odion: By beating level 11 or level 9 in Triple Duel three times.
Yami Marik: By beating level 14, level 12 or level 9 in Triple Duel.
Yami Bakura: By beating level 14 or level 11 in Triple Duel.

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

Level 1: Shimon, Grandpa, and Yugi
Level 2: Tea, Tristan, and Joey
Level 3: Bakura, Shadi, and Yami Yugi
Level 4: Weevil, Rex Raptor, and Mako
Level 5: Bonz, Bandit Keith, and Pegasus
Level 6: Mai, Yugi, and Kaiba
Level 7: Rare Hunter, Arkana, and Strings
Level 8: Espa Roba, Lumis, and Umbra, and Marik
Level 9: Ishizu, Odion, and Yami Marik
Level 10: Mai, Joey, and Marik
Level 11: Ishizu, Odion, and Yami Bakura
Level 12: Yami Marik, Kaiba, and Yami Yugi
Level 13: 3 Rare Hunters
Level 14: The Yamis of Marik, Bakura, and Yugi
Level 15: Kaiba's Dueling Machines