This is Jack Shadbolt (the cat, not the painter), enjoying a box. The best cat toys in existence don’t come from a cat toy manufacturer. They consist of a cardboard box, a string tied to a sick on one end and a crumpled bit of paper on the the other, and the best cat toy of all, a 3 or 4 foot length of craft paper draped over a box. If you want to get fancy, add two doorways to the box or make a castle with 3 or 4 boxes with passageways between them.
27th Street 
Craft paper is good for sliding on + if you make a craft paper tent, two cats will turn it into a play battleground.
Jack Shadbolt (the cat, not the painter) owns that box! Oddly, the SRK has never had a fondness for boxes, the first cat that I have ever known who hasn’t. Perhaps I should try the craft paper trick.