Boy, am I glad I invested in a carpeted kitty tree. Amelia is up and down that thing 500 times a day. I placed a hand-me-down upholstered chair next to it in case she gets stuck on the higher levels. She uses that for going up and down, or my older cat will sit on it and they'll play with each other through the gap between the seat and the back of the chair with the other cat on the platform at that level. She'll tear around like a madwoman for 20 min. and then zonk out totally at which point you can play with her like silly putty and she won't wake up.