Cats have an instinctual desire to watch cracks and crevices, especially when they know that something is hiding just beyond their sight. The Peek-A-Play Toy Box is designed to build on your cat's instinct by partially hiding some of your cat’s favorite toys, and your cat will go crazy fishing them out. And it is so easy to DIY!
On amazon, there are Top 4 best selling peek and play toys:
Pretty simple, and welcome by your kittens .One pizza box + some treats or ping pong = happy cats ~