1. Made of eco-friendly wood material, safe and odorless 2. Comes with an instruction manual, which includes 100 classic questions. The entire page is composed of questions, allowing you to design the questions based on it. After solving them, you can check the answers on the back page to see if your solutions are correct 3. Standard 9 x 9 number place grid, following the rule that numbers in rows, columns, and boxes do not repeat. It can effectively exercise children logical reasoning, concentration, and numerical ability 4. Solid wood blocks with number markings, easy to pick up and place without effort 5. The chessboard comes with a storage slot. The number blocks can be directly stored in the box, preventing loss and making storage convenient
