Crunchy Wall is the third stage in The Scratching Post.
THE SLOTH appears as a boss, with a 200% strength magnification.
Stall with Wall Cat, and max wallet and worker cat. When THE SLOTH comes out, spam everything. Ranged units are helpful here. Also use a few Uber Rares if you have any. Make sure to bring a cat CPU so when the THE SLOTH comes out it spams everything in time.