Every cat loves to hunt. You can observe their stalking techniques when they play. Imagine planting food around the house that your cat has to find, and work for. The bell in the container is an auditory signal for your furbaby when you fill it, and "hide" it. They can smell the food, and try to get it out by batting and rolling the container. Using their hunting skills they are rewarded with the food. This encourages them to keep working for the food. It also helps keep your cats weight in control. Having 2 or 3 is recommended, especially if your have more than one cat.