Wooden Chess Game Logic Training Board Children Intelligence Reasoning Chess Toys Gifts Condition: Item Type: Chess Game Material: Beech Function: Interesting early educational chess toys, help to cultivate children's logical thinking and attention. Size: Approx. 22.3 x 22.3 x 3.2cm / 8.8 x 8.8 x 1.3in (manual measurement, for reference only) Steps for Usage: 1. Set up questions: Use the black side of the chess to set up 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 an answer. 3. Completion: Look at the instructions to check whether the answer is correct.