Do you mean the stairs are prefect, and then there is somehow another 2 tiles without there reason to be? If you do, its quite difficult to make multiple layers for me, but I have this method. But unfortunatley it does not show either of them clearly in this pic. If you look up in the top right, you can see that the wall goes up off to the top, thats mean to be an incline, like a steady up hill slop to show how it is growing. Its difficult like I said.