I purchased this for my cat that weighs 15 lbs & 2 other kittens that weigh 5 & 6lbs, the kittens love it but my oder cat does not fit in it she is too big.  The kittens however love the activity center however i wished that the holes are smaller so that the cats can pop out the balls. The scratching post is also a plus as well since my kittens have nails. Overall its ok just wished the top resting bed was a little bigger so that my older cat can fit comfortablly on it.