What a great way to welcome a new generation of suduko solvers: these 6x6-sized grids provide the perfect introduction to most irresistible puzzles on Earth. 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.