Main Hall Level 30 upgrade requirements.
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When Workshop is Level 28:
|Main Hall Lv. 30||108,484,680||108,484,680||30,375,710||17,357,550||–|
|City Wall Lv.29||–||49,732,680||9,946,530||6,631,020||–|
F = Food
O = Oil
S = Steel
M = Minerals
U = Uranium