My sissy Kris gave the kitty crew one of those tube things for them to play in. Its open on both ends and there are 2 openings on the side. Zoey and Lucy spend alot of time chasing each other through it and Zoey likes to pop out the holes on the side. Its pretty funny when they end up scaring each other. Zoey will also hide in there and just swat her paws through the open holes. She has drawn blood on us on more than one occassion.