The Nina Ottosson by Outward Hound MultiPuzzle LEVEL 4 interactive dog puzzle toy will keep your dog entertained for hours as they use their natural hunting skills to seek out the hidden treats! Your pups' favorite dog treats can be hidden in the outer and central compartments by sliding the puzzle pieces and let the games begin! This puzzle is ideal for dogs who have already mastered levels 1-3 of the Nina Ottosson puzzle line. Made from tough plastic parts and food safe materials that are BPA, PVC, and phthalate-free. Hand Wash with soap and water to clean.