My cat is 2.5 years and loves this toy. I had her but only to show how it works and since then she plays several times a day. Unfortunately, even at night, which partly makes a tremendous crash. I'm building the rail but also always about, so it does not become boring. The large rail I also, but it is on a different floor in the house. I've done the flashing ball in the rail, on the other (it looks like a rubber ball) has not responded.