You want to give your children gifts at Christmas. You want parents and children to solve crosswords together. You want your children to stay from smartphones. "Sudoku for kids" book is a good choice: The book will help with training children's brains, improve their thinking. The book will be a meaningful gift for your children. The book will help the family to unite together with the Sudoku. And this book will help to keep your children away from tablets or smartphones. With lessons from easy to difficult levels, this book is perfect for your children. Sudoku is a pleasant way to exercise the little grey cells while utilizing time that might otherwise be wasted, such as standing in queue or riding public transportation. The easy puzzles quickly become repetitive, leading to a search for greater challenges. Eventually, one finds a puzzle that defies solution, leading to a search for strategies on the Internet or elsewhere. Most published strategies are based upon deductive reasoning. Some electronic versions of the puzzle allow users to automatically or manually list possible digits in unsolved cells. By looking for patterns of possible solutions with names like hidden pairs, X-wings and swordfishes, one can use deductive reasoning to eliminate digits as possible solutions in other cells, facilitating solution. This book includes: 4x4 grids: 12 Easy, 10 Medium, 10 Hard, 10 Expert. 5x5 grids: 20 Easy, 20 Medium, 20 Hard, 20 Expert. 6x6 grids: 15 Easy, 15 Medium, 15 Hard, 15 Expert. 7x7 grids: 15 Easy, 15 Medium, 15 Hard, 15 Expert. 8x8 grids: 20 Easy, 20 Medium, 20 Hard, 20 Expert. 9x9 grids: 20 Easy, 20 Medium, 20 Hard, 20 Expert. All Puzzles come complete with solutions.