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The World Championship is an international, invitational Yu-Gi-Oh! Trading Card Game tournament held annually —usually in Japan— between the top-ranked Duelists of various countries. In order to receive an invitation to the World Championship, a player generally must win a National event in their native country (during that year's main tournament season). Thus, the participants are National champions from various countries.
World Championship tournaments use a special banlist, where all cards are set at their lowest allowed status in any region. For example, a card that is on the Semi-Limited list in one region but the Limited list in another will be Limited on the World Championship banlist, and a card that is Forbidden in one region but Unlimited in another will be Forbidden. In addition, any cards that are not legal in any one of the regions are automatically Forbidden on the World Championship list.
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