To enter a password for a card, press R3 at the "Build Deck" screen, and enter an eight digit password:
Card - Password
Ancient Tree of Enlightenment - EKJHQ109
Aqua Dragon - JXCB6FU7
Beast King of the Swamp - QXNTQPAX
Birdface - N54T4TY5
Black Hole - UMJ10MQB
Blast Sphere - CZN5GD2X
Change of Heart - SBYDQM8B
Crush Card - SRA7L5YR
Dragonseeker - 81EZCH8B
Earthshaker - Y34PN1SV
Elf's Light - E5G3NRAD
Fairy King Trusdale - YF07QVEZ
Fairy's Gift - NVE7A3EZ
Gravity Bind - 0HNFG9WX
Greenkappa - YBJMCD6Z
Harpy's Feather Duster - 8HJHQPNP
Horn of the Unicorn - S14FGKQ1
Magician of Faith - GME1S3UM
Doppleganger(Mimicat) - 69YDQM85
Mystical Capture Chains - N1NDJMQ3
Barrel Dragon - GTJXSBJ7
Robotic Knight - S5S7NKNH
Royal Decree - 8TETQHE1
Left Arm of the Forbidden One - A5CF6HSH
Seiyaryu - 2H4D85J7
Serpentine Princess - UMQ3WZUZ
Map Edit Mode
In a custom battle if you defeat the white and the red rose story modes you will unlock map edit mode.
Rare and powerful Meteor B. Dragon
Go to the deck building menu and hit R3. Now you can enter the following password: yf25tr8h
Two square terrain field boost
If a monster gets a terrain field boost turn it face up and it will go two squares instead of one.
Go to the deck building menu and hit R3. Now use the following card password: 37689434.
Get all yu-gi-oh cards
Use the following card password: AYD245D9.
Blue eyes ultimate dragon
Go to build deck, press R3, then type: b6fjko98.
Get reincarnate ability
Surrender 5 times or get 5 wins so that you can reincarnate a card in your chest. Hit L3 to use the ability.
Starter decks Depending on the name used at the start of the game, you will get a different type of starter deck. Try names such as "Konami", "Rod", or "Puzzle".
Once you have the map edit mode enabled, edit the map to what ever preferences you want. Make sure you put labyrinth terrain all the way around where your opponents deck leader square. Then when you fight using your map, your opponent will not be able to play any cards. So you win on the first turn. Use this only for the reincarnate ability. Because you are unable to get cards from the graveyard slots, it is basically useless unless you want the reincarnate ability.