The erection of some special buildings like Ancient Portal, Statue of Fertility or Water Mill is rather hard and time and resource consuming. Every such construction is going through several stages, while every stage consists of five levels, just like on the screenshot. To finish the building and unlock its unique features, you need not only to complete the initial five levels, but also set up all the stages which total number can be up to ten. Moreover, you can receive additional quests between different levels or stages that you have to complete to proceed with the construction.
Be patient and persistent, and you're sure to complete the desired building!
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