I love Civilization (5 + 6 especially, hexes are great) but fundamentally each release in the series is not a video game in any traditional sense. ...
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I played CIv3 the most. The AI is brutal. But if you have military power and do aggressive movements you will probably gain the upper hand. I agree you need to be fast and furious on this game. It means no time to research every technology. Only the ones that progress you through the tech stack. Also selling maps is an easy way to get money.