SPJ: Sudoku Puzzle Board Game Arithmetic Early Childhood Education Educational Toys Mathematics Brain Training Size: 8.9  7.1 inches (Instructions included) "Sudoku" has been attracting attention from all generations from children to the elderly as learning to train the brain. Educational toys to be worn at home a habit to continue fun learning every day. This game provides many questions to get you started. While playing fun with Sudoku puzzles, please try to advance the learning of mathematics. Economical use repeatedly Unlike paper exercise books. Battery or power supply does not need.