Mainland balanced is a very good map, but I suggest to create a variation called balanced plainland which has no cliffs at all. Even better, no height differences at all, it should be perfectly plain, thats why it is called plainland. The balance could be even improved by making the map rotational symmetrical, so every player has the same starting conditions as every other player (if you divide balanced mainland into 8 "pieces of cakes", each piece looks different. If you would divide balance