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Alternatively, Civ 6 for the tablet could be amazing.

Definitely. I'd love to be able to pick up a Civ game I started on desktop and continue it on my tablet/smartphone on the go.

Civ 5 and Beyond Earth both have tablet modes. They work very well.

Tablet "mode" isn't too useful if I can't install it on my tablet in the first place.

It's the Surface Pro's killer app.