Once Yugi and his friends reach Duelist Kingdom, Pegasus announces that there are many strange secrets on the island which will make his ultimate tournament unlike any they have ever had. When Weevil begins to use these mysterious new rules against Yugi from within their duel, Yugi must not only figure the rules out, but master them as well if he is to survive. After Yugi defeats Weevil's first wave of Duel Monsters, he's shocked to discover that Weevil has one last trick up his sleeve; a ravenous Great Moth that grows in power with every turn. Yugi must find a way to destroy this winged beast before it destroys him.