Features & details ADVANCED LEVEL FUN: The Nina Ottosson level 3 Dog Twister puzzle dog toy is designed for advanced levels of problem-solving play that challenge your dog with learning sequential steps. A fun way for your smart pups to train their brain while redirecting destructive or negative behavior in an exciting way! SLIDE, PULL, & LOCK TO HIDE TREATS: Place the treats underneath the triangular block compartments and push in the white plastic tabs to lock the blocks in place. Your dog will have to lift the tabs sequentially to unlock the blocks and move them to reveal the treats! NO REMOVABLE PARTS & EASY TO CLEAN: Built in play pieces that don't come out when your dog plays to prevent choking. Durable construction also helps to keep this dog toy intact, making it your new go-to treat puzzle dog toy. BPA, PVC & PHTHALATE-FREE: Nina Ottosson by Outward Hound interactive treat dog puzzles are designed with your pet's health in mind from food safe materials that you can trust with your dog. Easy to clean with warm water and soap between uses.