Yu-Gi-Oh! Nightmare Troubadour Cheats

Two cards were mixed up with their effects: Blast with Chain & Kunai with Chain. Both of them increase a monster's attack by 500, but Kunai with chain can place an attack position monster in defense mode, and Blast with Chain can destroy a card on the field if it is destroyed by an opponent's card effect. If you have Blast with Chain face down on the field, and activate it you may notice that sometimes it comes up with a screen that says place a monster in defense position, increase attack, or both effects. If you ever encounter this problem always select increase attack, otherwise the effect will not activate.

If you are playing the U.S. version of the game, Pegasus will no longer appear after defeating Odion due to a bug in the game, so get his deck recipe and trade cards with him before he leaves or you'll be stuck with an incomplete file.

Even though the text of the card states the fiend monster with 500 or less atk has to be destroyed in battle, and it sends 10 cards from the opponent's deck to the graveyard.
The actual effect the computer uses is tributing 1 dark monster of 1000 atk or less, then for 3 turns any monnster with 1500 atk or higher on your side of the field, hand and draws are destroyed.

Totally different from the text it displays in the game.

If you've ever gotten the card: Blue Medicine, the card's effect on the game says that it will recover both you AND your opponent's Life Points. But when you activate it, it only heals YOUR Life Points. So now you can use it without the fear of regaining your opponent's Life Points.

During the expert tournament, if the player who's view is yours loses (Joey or Yugi), it counts as a loss on your own record.