Masonry[]
These are screenshots of the requirements for each level
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
This increases the amount of Rock you get each hour in your city.
These Are all of the current Levels as of April 2018 - 10/10