OCG stands for Original Card Game. This variant of the Yu-Gi-Oh! Trading Card Game is used in the Asian countries like North-Korea and the homeland of Yu-Gi-Oh!: Japan.
Whereas the TCG is for all non-Asian countries, the OCG is tehre for all Asian countries. Every new set is first released in the OCG before beign released in the TCG but there are TCG-only packs and cards but like there are OCG-only packs and cards, everyone of those cards with be send to their counterpart in time via Collector's Tins or Extra Packs.
Cards exclusive to the OCG cannot be used in the TCG.
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