Hi, I am leveling up my TC as fast as I can, and I would like to know how much iron to prepare, and how much I will have to wait.
Is there a guide somewhere listing the level up requirements, for instance for going from TC12 to TC13?
Welcome to the E&P board.
Click on upgrade of a building to see the costs for the next level. Then hold your iron pressed to see your actual max amount.
Afterwards calculate.
Upgrade your iron storages just as far as needed and keep your watchtower following the base.
After your stronghold has next level, upgrade all your mills and mines alternately followed by your tcs. VIP helps a lot to prgress faster.
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If you want to know up front what everything will cost you can check on this site as well:
There is tons of good information to find there as well 
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Aaaaaaaah
Now I see it, thanks a lot.
I knew this page, I just did not realize that there was a tab to be pressed to see the cost of upgrades.
I see I will need 516k iron for TC13, plus 443 food for research
@Olmor: thanks for the answer. I cannot click on the TC and see the cost, because the upgrade to TC12 is still in progress, and I want to see the cost of TC13.
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