The Master’s Blueprint is an item which is required in order to upgrade the buildings from Lv.24 to Lv.25
Master’s Blueprint can be purchased in the Shop, or when attempting to upgrade Lv. 24 buildings to Lv. 25 buildings with insufficient Master’s Blueprint for a cost of 2,000 Gems.
Description Gained from Master’s BlueprintCan be used to upgrade city buildings from Level 24 to Level 25 .