

However, in 2008, UDE lost the license amid some allegations of wrongdoing, and now the TCG is administered by Konami as well. The other administration setup, called the Yu-Gi-Oh! Trading Card Game, or TCG, was originally manufactured and distributed by Upper Deck Entertainment, at Konami's own behest, throughout the remaining territories worldwide.

The so-called Official Card Game, or OCG, has been handled by Konami since the beginning it administers East Asia. Yu-Gi-Oh! has different names and administration structures in different territories. Aside from the Dungeon Dice Monsters arc in the anime and the Capsule Monsters spin-off, all future media works in the Yu-Gi-Oh! franchise focused exclusively on Konami's card game. The real game made considerable changes to the rules originally established by Takahashi, and so the manga and anime were revised to more closely reflect the rules of the real game.

This is the game that stuck and became the centerpiece of the Yu-Gi-Oh! franchise. Konami properly released their version of card game in February 1999, as Yu-Gi-Oh! Official Card Game (before then, they also released a brief series of unplayable collector cards). Bandai and Toei's card game did not last, because around late 1998 and early 1999, Konami acquired the rights to the Yu-Gi-Oh! brand. Bandai released a version of the card game in September 1998 known as Yu-Gi-Oh! (Carddas Version), coinciding with the Toei anime adaptation (the Toei anime also renamed M&W to Duel Monsters as the game's in-universe name). As the Yu-Gi-Oh! manga began to expand into a multimedia franchise, interest grew to defictionalize the game and turn it into a real game.
