In exchange for Joey's freedom, Yugi agrees to give up Duel Monsters forever if he loses. Unfamiliar with the rules of Dungeon Dice Monsters, Yugi gets off to a bad start. Duke reveals that he had designed Dungeon Dice Monsters with Pegasus' aid and also tells Yugi that he seeks revenge against him for cheating against Pegasus during their past duel. Yugi denies that he cheated against Pegasus, but Duke does not listen.