Yu-Gi-Oh! Millennium World is part of the English Yu-Gi-Oh! manga. It occurs after Yu-Gi-Oh! Duelist. In this arc, the plot has shifted to the pharaoh returning to Egypt and Duel Monsters is played less frequently. While the Japanese manga continued numbering as normal keeping the name Yu-Gi-Oh!, Yu-Gi-Oh! Millennium World started numbering Volumes and Chapters from 1.
The first chapter, Duel 1 is Battle 279 in the Japanese manga.
With Yu-Gi-Oh! Millennium World came the reappearance of Yu-Gi-Oh! in Shonen Jump in the United States, which had been discontinued since the end of the original seventh volume.