This is an educational toy that my child loved playing with at nursery school and that we also bought for home a few years ago. These are genuine blocks with the manufacturer's logo on each piece. These blocks are characterized by their unique side joints on square and triangular blocks. They're not just blocks that you stack; you can connect them up, down, left, right, and diagonally, allowing for a wider variety of shapes and expanding the fun. This set of 300 pieces, including a case, was purchased for just under 10,000 yen. There are no instructions. The blocks have been disinfected and cleaned. We do not have any pets or smokers in our home.