Great mode! However there is something wrong about the city radius size. When I reach the 3rd level of culture, the city raduis becomes 3 tiles, and it's fine. While the 4th level culture, the city narrows back to 2 tile radius it can work on. At the same time, it still blocks the 3-rd radius tiles making them inaccessible for the neighbour cities unless you reassign these tiles mannually. AI builds and recommends the human player to build cities with 6-7 tiles interval which is waste of space. Unfortunately, I have noticed no posts about this problem.