I am at level 20 and I want to upgrade my castle to level 21, but I'm stuck with iron storage, after..
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I am at level 20 and I want to upgrade my castle to level 21, but I'm stuck with iron storage, after upgrading everything the maximum iron saved is 21.5m, and for upgrade to level 21 it requires 28m iron, How to increase iron storage
You need to upgrade the Iron Warehouse buildings. If you have already completed level 10 on Iron Warehouse 2. Then find a build Iron warehouse 3 to continue adding to your storage. Iron warehouse 3 will require around 4M in gold to start the build.
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