Castle Wall

The Castle Wall is the most powerful of the three walls and is the final wall. You will be able to choose it on Age 7 and it takes 35 Stone to build and you can build 30 of them, just like the Wooden Wall and the Stone Wall. You can only choose this wall if you have chosen the Stone Wall on Age 3, and if you haven't chosen the Stone Wall, then Cheese will take its place as one of the things to choose when you reach Age 7.