Challenge Game: is a 4-level puzzle game with the highest difficulty! To be rewarded, your dog must perform a series of actions in a specific order. How to play: Place treats in the outer rail and the middle compartment under the slider. Slide to hide snacks. Here we go! Helps Avoid Destructive Behaviors: By creating a positive outlet to channel your dog’s urge to hunt, you can stop them and avoid unwanted behaviors. < p>Non-Removable Parts: These parts stay in place while your dog plays this game. It’s extremely durable and won’t break, making it your dog’s new must-have plaything. BPA, PVC, Phthalate Free: Made with food grade materials that are safe for your dog. Made of sturdy hard plastic, this dog puzzle is hand washable with soap and water.