I had already tried this product in the past (2 of them). One was defective but replaced with pictures and video to prove it had been made upside down. They was no way to zip the 2 parts together. My cats never played nor approached them. Our new Lab puppy took care of destroying them both by eating some pieces which got him sick by the way :(
As my 2 cats got older, I thought I would give it another try. How stupid of ME! They absolutely ignore the two I have recently bought them. CONCLUSION: BIG WASTE OF MONEY.