As some of you know, Tzolk'in may be unbalanced at 4 players with corn and wood monuments and very unbalanced at 3 players due to skull player advantage.
I know that Tzolk'in expansion exists, I already played with it but not against experts/masters, so I don't know if the expansion is enough to compensate the unbalance. But maybe that could be a good thing to add the expansion to BGA. Let me know what you think about that.
More generally, what are the criterias to add an expansion or a new game to BGA ?