Each circuit consists of a ball that zips around a closed track in rollercoaster fashion. The special peek-a-boo cover stimulates cats to chase and swat the ball, which quickly adds up to hours of entertainment! 100+ layouts! To keep your cat interested, you need to change their toy set-up often. The Senses 2.0 Circuits can be built and rebuilt into different shapes around the house. Surprise your cat with a new layout every few days to keep the experience fresh and exciting! The Wave Circuit offers elevation for more diverse movements. The included circuit ball is the perfect size and weight to bat around. Combine with other Senses 2.0 products Catit Senses 2.0 products were specifically designed to be mixed and matched, so you can create a new set of toys and change your cat’s play environment frequently to keep them interested.