[ Difficulty-Level Adjustable ] - Are you worried about whether this enrichment toys for dogs is too difficult or too easy for your pet? By taking off some slider parts, you can make this dog puzzles simpler; instead, by installing all the slider parts, it will increase this dog puzzles difficulty level to the hardest for smart dogs. Slowly increase the difficulty level, and find the right level to excite your pet. [ Slow Feeder ] - More than 50% of pets have obesity which directly increase the risks of heart disease and other health issues, and overeating became the first cause of obesity for pets. This situation can be relieved once your pet use this food puzzles for dogs, it can significantly extend the length of feeding time by 6-9 times. [ 2021 Upgraded Edetioned ] - Compared to other products on the market, our upgraded new edition dog brain stimulating toys have more food storage holes, and the bright colours can instantly grab pets’ attention, generates more joys for you pets.