Sudoku Wooden Educational Toy Brain Training Use the black text as the problem and the red text as your answer. There are 100 problems! The answers are on the back page. Please consider after checking the images. The color may differ slightly from the actual product due to the brightness of the shooting environment and your device. Please consider after understanding this. This is a used item, so we appreciate your understanding regarding scratches, dirt, and signs of use. The box is particularly damaged, so it will be included as packing material.