The Nina Ottosson by Outward Hound Dog Worker puzzle dog toy is a challenging level 3 puzzle game that will keep your dog busy for hours as they use their instincts to hunt for hidden treats. This advanced interactive dog puzzle game has 3 steps that your dog will need to learn in order to get to the tasty rewards: swivel the flippers, scoot the blocks, and spin the center wheel. Hidden compartments are under the flippers and under the center wheel. Available in multiple colors. Made with no removable pieces from a BPA, PVC, and phthalate-free composite material. Clean with warm water and soap.