Here is Tom using zip ties to keep the inner pannels against the wall, so he can't use them for leverage. We have also added more cubes to make the walls higher all the way around. I only put them up when I am not going to be home. Hate to have him get out and into something. He was really climbing the corner cubes trying to get out. The problem was he was in the back corner. I don't know where he was going to go when he got to the top.