Thanks again everyone. His uncle has pretty much every game imaginable so I asked him to show DS Kerbal Space Program and Space Engineers (of course he had both). DS played Kerbal Space Program a lot and then Space Engineers a little (then we ran out of time). I asked which one he likes better and he said he likes both a lot. So I will watch for sales. Also we got the Stronghold collection in the mail. He has been playing Stronghold 2 a lot.

Dh said he actually has Civ V but thought that DS was too young so never mentioned it.