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During their [[Main Phase]], the [[turn player]] can Xyz Summon an [[Xyz Monster]] from their [[Extra Deck]] by vertically stacking from their [[field]], two or more [[face-up]] monsters with the same [[Level]] as the Xyz Monster's [[Rank]], that are listed on it as [[Xyz Material]]s. After that, the player Summons the Xyz Monster from the Extra Deck in [[face-up]] [[Attack Position|Attack]] or [[Defense Position]] by placing it on top of the stacked Xyz Materials in an unoccupied [[Main Monster Zone]] that a [[Link Monster]] [[points to]] or an [[Extra Monster Zone]].
Monsters that do not have Levels, such as Xyz Monsters and [[Link Monster]]s, cannot be used as Xyz Materials for an Xyz Summon. However, there's is an exception of this rule in some cases because some Xyz Monsters' card text does also mention that it can be Xyz summoned by using another Xyz Monster on the field (which does fulfill a certain condition(s) mentioned in the card text) as its Xyz Material.
Prior to the introduction of the [[Extra Monster Zone]]s, a monster could be Xyz Summoned to any [[Monster Zone]].
