Cheat Codes
Go to Clocks Square and head south to get to Grandfather's Card Shop. Use the computer and enter a cheat code to unlock one of many bonus cards. Enter "52367652" to unlock Life Eater or "40387124" for Abyss Flower. The code "31339260" unlocks Zombie Warrior and "53829412" gets Griffore. Input "69140098," "93920745," "76775123" or "32355828" for Gemini Elf, Penguin Soldier, Patrol Robo or Skelgon respectively. For Larvae Moth, Little Chimera, Spiked Snail or Magician of Faith, enter "87756343," "68658728," "98075147" or "31560081" in that order. Use the code "54652250" to unlock Man-Eater Bug and "66516792" for Serpent Night Dragon.
Acquire Exodia Easily
Save the game and then walk over to Grandfather's Card Shop. Find Yugi Motu and duel him, betting a star card that you will win. Defeat Yugi Moto; he is an easy opponent. You now have one piece of Exodia. All you have to do now is beat him four more times and you have all five pieces of Exodia The Forbidden One, an extremely powerful card.
New Location
Defeat Reshef in a duel and immediately turn off the game. Turn it back on and check your map; the Hall of Eternity will appear on it. This new location is home to a pair of new characters called Noah and Shadi. It is an area where you can battle Kaiba, Yami Yugi and Yami Bakura and Dark Joey.
Skip Egyptian Duel
Odeon will meet you when you arrive in Egypt. Normally he will ask you a couple of questions and then challenge you to a duel, but there is a trick to skipping the fight. When he asks you why you have come, tell him that you will come back later. This will anger Joey and you will be ordered inside, meaning you are exactly where you want to be without fighting a difficult duel.