Field Zone

Box number "1" is your Field Card Zone. Only 1 Field Spell Card may be active at any time, and any new card that is activated here replace one on the other side of the field, if present. You may activate a Field Spell Card if there is one already present on your side of the field. By doing so, the first Field Spell Card is replaced and sent to the Graveyard. A Field Spell Card may be also be Set here, instead of Activated. If it is Set, and there is already a Field Spell Card on your opponent's side of the field, that Field Spell Card is not replaced.