Yu-Gi-Oh! Duel Monsters: Season 1, Episode 4

1 - 4: Into the Hornet's Nest

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’ve ever had. But when Haga begins to use these mysterious new rules against Yugi in a duel, Yugi must not only figure the rules out, but master them if he’s to survive!