Answer:
I have a little house in which I live all alone. My house has no doors or windows and if I want to go out I must break through the wall.
I go up and never come down no matter how hard you wish. As I get higher, more wrinkles crawl on to the face. What am I?
I jump when I walk and sit when I stand.
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
I am heavy forward but backward I'm not.
Some try to hide some try to cheat. But time will show we always will meet. Try as you might to guess my name. I promise you'll know when you I do claim.