Feature: 1. Made of high‑quality beech wood, the wood grain is thin and straight, the structure is less variegated, and the surface is coated with environmentally friendly water‑based paint. 2. It can help children strengthen the logical thinking ability of the brain in the process of reasoning and thinking, and enjoy the sense of accomplishment after solving problems. 3. Perform arithmetic operations with children to enhance parent‑child interaction and communication, and improve children's intellectual development. 4. Interesting early education toys can help develop children's logical thinking and attention. 5. Lightweight and portable, easy to carry and store, it is an excellent gift for children. Specification: Item Type: Wooden Chess Game Material: Beech WoodFunction: Fun early education toy, which helps to cultivate children's logical thinking and attention Size: Approx. 22.3x22.3x3.2cm/8.8x8.8x1.3in (Manual measurement, for reference only) How to Use: 1. Set The Questions: Use the black side of the chess pieces to set the questions, and beginners can follow the instructions. 2. Rule: According to the known numbers on the 9×9 disk, all the numbers in the remaining spaces are inferred, and the numbers in each row, column, and each bold line must contain 1-9, without repetition. Every qualified question has and has one answer 3. Completion: Look at the instructions to check if the answer is correct. Package List: 1 x Chess Box with Drawer (Can be divided into two halves)81 x Digital Wooden Block1 x Manual1 x White Sticker (Can Be Pasted)