Cats have a natural hunting instinct and prey drive that putting down a bowl of food just can't satisfy. Puzzle and interactive toys ease anxiety by relieving boredom and providing mental stimulation and exercise - plus they are long-lasting fun.
They're called 'enrichment' because they challenge their mind, their senses, and their dexterity; making their world so much more interesing. And since many of these toys require some interaction or set up, they build bonds between cats and their humans.