Hello!
I had a problem, with the Great City edict in the game. It wasn't clear to me based on the wording of the edict, that if in my biggest city, if I place a single tile adjacent to a mountain, that tile won't score, or the whole city will be ineligible for scoring from that point on. My opponent had the misfortune to try this out, so by now, I know, that it invalidates your whole city.
Maybe you could update the wording a bit, to make this more clear?
Thanks!:)