These 6X6-sized grids provide the perfect introduction for kids to these irresistible puzzles. Most kids will already have seen their parents engrossed in solving a sudoku, whether in a newspaper or book, so they'll be primed to try it themselves. And with 21 feet to practice on - 176 puzzles in all - they'll really be able to perfect their game. An introduction explains all the basics and gives smart tips on how to figure out what number goes where.