20 uses for a piece of cardboard

We bought a calendar and it had a piece of cardboard inside it. My son immediately seized it and had me cut a whole in the center. He then spent at least two hours playing with the thing.
Game # 1 -Karate style board chopping.

Game # 6 Walking Picture Frame


Game # 18 Wearing a Bracelet - I know it LOOKS like the Karate thing from Game # 1, but it was supposed to be a fashionable accessory in this case.

I don't know why we bother buying him toys.