The plot follows the story of a boy named Yugi Mutou, who solves the ancient Millennium Puzzle, and awakens a gambling alter-ego within his body that solves his conflicts using various games.
Two anime adaptations were produced; one by Toei Animation which aired in 1998 and another produced by Nihon Ad Systems which aired between April 2000 and September 2004. The manga series has spawned a franchise that includes multiple spinoff manga and anime series, a trading card game and numerous video games. Most of the incarnations of the franchise involve the fictional trading card game called Duel Monsters (originally known as Magic & Wizards), where each player uses cards to "duel" each other in a mock battle of fantasy "monsters". The Yu-Gi-Oh! Trading Card Game is the real world counterpart to this fictional game on which it is loosely based.