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{{Infobox/Archetype/ExtendedName
| kanji = エクストラデッキ{{ru|EX|エクストラ}}デッキ<br>Formerly: {{Ruby|融|ゆう}}{{Ruby|合|ごう}}デッキ | japanese = エクストラデッキEXデッキ<br>Formerly: 融合デッキ
| furigana = エクストラデッキ<br>Formerly: ゆうごうデッキ
| romaji = Ekusutora Dekki<br>Formerly: Yūgō Dekki
{{Infobox/Archetype/End}}
The '''Extra Deck''' (Japanese: エクストラデッキ ''Ekusutora Dekki''; abbreviated {{Ruby|ＥＸEX|エクストラ}}デッキ ''Ekusutora Dekki''; エクストラデッキ in [[card text]] before from ''[[Code of the Duelist]]''onwards), formerly known as '''Fusion Deck''' ({{Ruby|融|ゆう}}{{Ruby|合|ごう}}デッキ ''Yūgō Dekki''), is a Deck where [[Fusion Monster]]s, [[Synchro Monster]]s, [[Xyz Monster]]s, and [[Link Monster]]s, (as well as [[Pendulum Monster]]s that would otherwise have been sent from the [[field]] to the [[Graveyard]]), are stored during a [[Duel]]. Any old card that still refers to the Fusion Deck applies to the Extra Deck.
The Extra Deck is separate from the [[Main Deck]] and is placed face-down in the [[Extra Deck Zone]]. Like the Main Deck, the number of cards in the Extra Deck is [[public knowledge]]. Unlike the Main Deck, the player that possesses it can look through it at any time. The face-down contents of the Extra Deck are not public knowledge, so the opponent cannot look through face-down cards in the Extra Deck; however, the face-up cards in the Extra Deck are public knowledge, so either player may look through them at any time.<ref>{{cite book |author=Konami |title=Yu-Gi-Oh! Official Card Game - Perfect Rulebook 2015 |url=https://ygorganization.com/perfectrulebook/ |page=43}}</ref>
