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I cannot buy another upgrade for my sword because it says the building is too low level. So how do I further upgrade my building? All rooms have been built.

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You need to gather wood and stone, which will allow you to upgrade your rooms so you can upgrade further. If I remember correctly, each room has 3 levels of upgrades.

The upgrade button, which is easy to miss, is to be found on the top right corner of the shop window:

Where to find the upgrade button

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    I added a picture where to find the upgrade button since that was the root of my issue, not to grasp the concept of getting wood and stone.
    – user28015
    Jul 2, 2013 at 16:32
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    @noneofyourbusiness no problem I was planning to do that later. I'm at work so I can't get to the image.
    – l I
    Jul 2, 2013 at 16:52
  • "If I remember correctly, each room has 3 levels of upgrades." I believe the training room has 4 levels.
    – Martin Ender
    Jul 11, 2016 at 8:39

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