just idea about stone-as-a-resource. What if instead of stone we use something like lime-stone, or marble? It could be a required resource for some important buildings like temple and library, or may be even some of the happiness-cultural wonders like Pyramids, Hanging Gardens, and so on. And even Palace upgrade can be tight to this resource (no palace upgrade until resource secured)
just some crazy ideas your way ...
just some crazy ideas your way ...
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