Back wall is a rock climbing wall leading to the fort above. Below and to the left is a tube for crawling thru. Yep, kids are army brats in training. For the girls, the stairs lead up to a kitchen they can play in while mom is cooking dinner down below. Of course, don't forget the baby is napping in his swing while everyone is busy playing and working. Once in a while the kids sneak out of their play areas and do laps around the room on their bikes and cars.