What about if morphology played an important role in the game?
Let's say, city A is on a mountain landscape. It will be natural to develop and improve mining capabilities, thermal control for buildings, etc. City B is nearby the shore -> more improvement in fishing technique, navigation, etc. Then, as an example, city A would have a surplus of iron, but some lack of food. City B will have no such resources to build up the city, but more food to trade...
And so on....
Also, it would be really nice if weather could change during the time. Imagine if city C has been built in the countryside, where the weather is generally good. Then, a kind a short ice age happens -> city C will need to develop the same knowledge and technology fo city A, or get them from city A (paying for it, or exchanging knowledge, or creating new trade routes etc).
I see there are many potential scenarios for cooperation to play an important role in the game. Those players who will be able to build better relationships with others will be having more success...
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