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''TCG'' cards are not legal in ''OCG'' tournaments. Due to Japanese, Asian-English and Korean cards having different [[Card backing|backings]], if a player chooses to use a mixture, they must use protective sleeves that cover the back of the cards.
''OCG'' tournaments are divided into three classes: Expert, which has no age restriction, Regular: for secondary high school students and Challenge, for primary secondary school students.
Japanese cards (JP) used to be distributed in all over Asian territories, but now exclusively in Japan by Konami of Japan. Korean cards are only printed in South Korea, and distributed by [[wikipedia:Daewon Media|Daewon Media]]. Asian-English, Japanese-Asian and Traditional Chinese cards are distributed in other parts of Asia by Konami of Hong Kong.
