Thank you for viewing. We do not have any pets and are non-smokers. From the official website: "NEW Sankaku Tangram" is a shape puzzle that uses only right-angled isosceles triangular wooden pieces to create various shapes. Compared to the "Tangram" which uses 7 different types of pieces, this puzzle is easier because it uses only one type of piece. It comes with a guide board, and you start by fitting in one piece, so even young children can enjoy it while getting familiar with shapes. By matching shapes, you can improve the dexterity of your hands and fingers, and cultivate a sense of shapes.