1. Poke hole in a cardboard box.
This is a ridiculously easy puzzle to make and it happens to be disposable and recyclable so it's great option for shelters.
Square objects, as a rule, are quite difficult. It is not recommended to frustrate your cat so please only offer this style toy if you cat is up for the challenge.
Weights, other small cat toys and smaller food puzzles can all be placed inside to increase the challenge.
2. Fill with deliciousness and offer box to cat.
3. Commence with foraging.
4. Happy and challenged cat.