Sketches prove particularly useful in that they can upgrade many of the Buildings in your Castle, thus improving the bonuses they provide which, in turn, makes these Buildings far more effective! Before upgrading your Buildings with Sketches, and taking full advantage of the bonuses they’ll give, you need to first ensure that your Buildings have been upgraded to a particular Level.
Get Sketches from the Black Market by going to the Sketches section of the “Resources” tab.
Here is a list of the Buildings Sketches can be used to upgrade:
Be advised that the exact bonuses that Sketches provide to your Buildings varies depending upon the Building in question. To find this out, simply go to the “Info” tab - if applicable - on any of the Buildings above to view which bonuses you will receive with each upgrade Level.
In order to upgrade your Town Hall above Level 20, it is necessary to first upgrade all the required Buildings at your Castle to the specified Levels.
With Sketches you can now develop your Castle to its full potential and conquer your rivals!