S is 36x36, M is 72x72, meaning S+U is twice as small in area as M-U.
Therefore, on S, to get zones different from "castle+2 mines," you need to make two of them per level, totaling 4 zones on the map.
In the M-N range, the exact upper limit (N) is not generated. For example, in the 8mm6a map, the upper range is 15K-20K, and relics are not generated, but they have a value of 20K.
Осень-Зима 2013-14.