Main Monster Zones are the 5 zones directly above the Spell & Trap Card Zones where monsters are placed on the field. Before the introduction of the Extra Monster Zones, these were originally called Monster Card Zones.

As of Master Rules 4, monsters Summoned from the Extra Deck must be Summoned to either an Extra Monster Zone to a Main Monster Zone that a Link Monster points to. If control of a monster in an Extra Monster Zone is changed, it is placed in the Main Monster Zone (even if control is changed back later).

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