By Nina Ottosson, the Dog Worker interactive puzzle (Level 3: Advanced) is designed to stimulate your dog's brain and allow him to have a blast at the same time! This unique, interactive toy provides hours of fun every time your dog plays with it. Just hide treats in each compartment and watch as your dog slides around the built-in pieces to find them. Each piece is designed to stay in place while the durable construction helps to keep this toy intact, even after your dog plays again and again. Spin the top to open and close the tracks, move the blocks to unlock the flippers and rotate the flippers to expose the treats. Featuring multiple compartments, there are plenty of spaces to hide treats and numerous ways to find rewards.