Wicc
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Well, the save file will probably be given to players right before the game starts, and then the mechanism will be the same as in regular games.
2 loi
I repeat, there's no point in playing on CMs (Challenge Maps).
If you think there is, then make the save files yourself, because I don't want to be exposed to a flood of criticism from players who get the weaker side. And I don't have the time or desire to create balanced generations.
Therefore, if I do make them, it will only be symmetrical save files, with a structure similar to CMs.