This is a wonderful gift I got my kitties for their birthday present. I have a 1 year old kitten and a 10 year old cat,and I wish I had a camera for when I pulled the box into the apartment.I had just opened it,and it comes in 3 parts,but my 10 year old went into the box, and the kitten jumped onto the biggest part as soon as I pulled it out.They love it! The kitten is only about 8 pounds,ny 10 year old is about 19 pounds and fat-they both use it,and play with each other on the different levels.It is most certainly sturdy, and the nicest thing I could have gotten for my little sweethearts.It was very expensive for me, at under 200,00 but I must say it is worth every penny .Thanks, Wayfair!