When dueling Weevil, his entire deck is full of Insects. Use Pyro Monsters against him.
This even works with Pyro Monsters that have low attack points. Use Fire/Pryo Monster
against him, even if they do not have ATK points.

If you have already entered the ship, get off of it and save. Next, go to the pier, the
graveyard, and the park to duel the duelists there. When your deck capacity has reached
over 3,000, get back to the ship and duel Marik. Make sure you have either fiends or
magicians. If that is not your style, use your own but make sure you have at least three
copies of the field magic card that you are using. You should also have Obelisk and Slifer
in your deck. Their cost is 0 each.

Use a lot of flying monsters such as Harpie Lady or Harpie Ladie Sisters. Do this because
Odion has all Rock and Ground monsters. He really does not use trap cards like in other
games and the television show.

When you use "Stop Defense", all of your opponent's monsters well be in attack mode for
two turns. This includes this turn and the next turn.

Use Thunder and Wind monsters. Thunder defeats all Aqua, and he has some Earth monsters.
Use Wind against them.

You will duel Mako by dueling everybody in and out of the Aquarium.

Before you start dueling in the final match against the evil side of Marik, go back to
your (player's) home and save your game. Afterwards, return to the Kaiba Tower and duel
Marik. After winning the duel, the game will end. However if you want to duel Marik again,
simply turn off the game and turn it back on. Select the option at the main menu to
continue the game. Go to the Kaiba Tower to Marik and duel him again. Note: When
you are using this trick, do not select "New Game" at the main menu or you will start a
new game with or without saving. You can also do this with other duelists if you want duel
him or her again.

To get to the Finals, you must have Obelisk The Tormenter, six Locator Cards, and at least
a 3,000 Deck Capacity.