Yu-Gi-Oh! World Championship Tournament 2004 Opponents

This is a listing of opponents in Yu-Gi-Oh! World Championship Tournament 2004, including how to unlock them, an overview of their Deck and strategies.

Level 1 opponents
All Level 1 opponents are available at the start of the game.

Level 2 opponents
Before Level 2 opponents can be unlocked, all Level 1 opponents must be defeated at least 3 times each. After that, you must have a certain amount of cards from each starting Booster Pack. After acquiring the amount from a particular booster pack, the corresponding opponent is unlocked.

Level 3 opponents
Level 3 opponents can only be unlocked after all Level 2 opponents have been defeated at least 5 times each. In addition, each duelist requires the player to have a certain card (or cards) in their Trunk, but not in their Deck.

Level 4 opponents
After all Level 3 opponents have been defeated at least 7 times each, the player can then select random Ghouls as opponents. When all five Ghouls have been defeated in a row, Marik Ishtar will be unlocked. After Marik is defeated, the random Ghoul opponent is replaced by the individual Ghouls.

The Ghouls are also the first opponents with illegal Decks, using multiple copies of powerful Limited cards such as "Raigeki" or "Pot of Greed".

Level 5 opponents
With the exception of Marik Ishtar, all Level 5 opponents are only available if all Level 4 duelists have been defeated at least 10 times.

Level 6 opponents
Level 6 opponents are only unlockable when all Level 5 opponents have been defeated at least 15 times each. They are all unlocked by defeating certain opponents three times in a row, and will Duel the player when the opponent is chosen a fourth time. If defeated, they will remain unlocked for the rest of the game.