Using a specific code with a Gameshark cheat device, it's possible to view your opponent's cards in their hand during play. Utilizing this cheat, it's been discovered that the CPU opponents are programmed with an unfair advantage allowing them to change the cards drawn from their deck into entirely different cards to better suite the course of a match (i.e. changing an unnecessary Trap or Spell card into a Monster card that has high enough ATK points to destroy a powerful Monster card the player may have placed on the field the turn prior).