Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist is a Game Boy Color game and the fourth installment in the Duel Monsters series of Yu-Gi-Oh! It features 900 different cards and was released as three seperate versions, each having a unique selection of cards that can be used during the story and traded with the other versions. This version focuses on Joey Wheeler and the god card Winged Dragon of Ra.