"Monster World" is the seventh volume of the Yu-Gi-Oh! manga. It is the last manga titled Yu-Gi-Oh! in the English series, as the next volume part of the Yu-Gi-Oh! Duelist series. In the Japanese version, this volume went up to chapter 60. This was the first chapter in the Duel Monsters centered universe, so in the English manga it was excluded and added as chapter 1 of the next volume, which is the first volume of Yu-Gi-Oh! Duelist.