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Maybe we don't need any of these complicated things. Just a large map and strong creatures, like in a regular game. Just a shorter timer and a standard exit condition: not at the beginning of the 2nd week, but at the beginning of the 3rd week. Why not?
Ideally, a special template would be needed, something like a "water jebuss," with gold mines in the strait between the rocks, and cities and villages on bare islands with mines and shipyards, while all the resources are on the water or other islands. I wonder if it's possible to implement something like that?