Locked buildings are marked with a padlock icon, showing the Experience Level required to unlock it.
You can unlock new buildings as follows:
- If you are a level short of the requirements, spend Crystals to access the building right away.
- If the requirements have been met, find 4 blueprint pieces by completing match-3 levels in other buildings.
Once you have collected all 4 blueprint pieces, you can unlock the building by tapping it.