Features： 1、Open cover type chess box, more convenient for storage and not easy to fall off after cover. 2、Include three sets, which are 4 x 4, 6 x 6, and 9 x 9 respectively, meeting different demands. 3、The chess pieces are printed on both sides, one red and one black, which is convenient for setting and solving problems. 4、22.5 x 22.5 x 4cm / 8.9 x 8.9 x 1.6in of the size, not easy to crack, delicate hand feelings and clear in texture. 5、Number chess and wooden frame are made of natural materials, which are sturdy, resistant to fall. Specification： Item Type: Number Puzzle Board Game Material: Wood Size: Approx. 22.5 x 22.5 x 4cm / 8.9 x 8.9 x 1.6in Usage: 4 x 4: Divided into four 2 rows, 2 columns square, fill in the numbers 1 to 4 and cannot repeat, and on each line to fill in the Numbers 1 to 4 and cannot repeat, each column to fill in the Numbers 1 to 4 and cannot be repeated. 6 x 6: Divided into six square with 2 rows and 3 columns, fill in the Numbers 1 to 6 and cannot repeat, and on each line to fill in the Numbers 1 to 6 and cannot repeat, each column to fill in the Numbers 1 to 6 and cannot be repeated. 9 x 9: Divided into nine 3 rows, 3 columns square, fill in the Numbers 1 to 9 and cannot repeat, and on each line to fill in the Numbers 1 to 9 and cannot repeat, each column to fill in the Numbers 1 to 9 and cannot be repeated. Notes: 1. Wooden toys can not be washed with water, can not boil in high temperature water 2. This product is not suitable for children under 3 years old to play with. It contains small elements or small balls. Do not swallow small parts. 3. Before use, please put away the packaging bags in time to avoid room breathing caused by children playing; At the same time, remove the appendages that do not belong to the toy. Please play with the product under the supervision of an adult. Package List： 1 x Wood Board 1 x Chess Box 99 x Chess 1 x Adhesive 1 x Chess Storage Tray