Sharpen Your Brain with this SUDOKU Puzzles Book Sudoku puzzles add a fresh challenge to your mental workout. Although they are number puzzles, they do not require math skills. The objective of these crosswords without words is to place the numbers 1 through 9 only once. The same single integer may not appear twice in the same row, column, or any of the nine 3�3 subregions of the 9x9 playing board. Never would have guessed, all the puzzles can be solved by logicical. Brain Games: Sudoku puzzles are sorted into four levels of difficulty. The book s introduction offers helpful tips and techniques for solving the puzzles, starting with the process of elimination. As you work through the sudoku puzzles, you will uncover your own techniques for solving them. Answers to every puzzle are provided at the back of the book.br> Whether you are new to sudoku or craving a fresh challenge, Brain Games: Sudoku will give your brain a healthy workout. The book features:More than 400 sudoku puzzles, arranged in order of difficulty. Whatever your level, you'll love this Sudoku puzzle book. The 400 puzzles increase in difficulty from warm-ups to total mind-bogglers-perfect for players who want to gradually improve their skills and for masters who want a range of challenges to stay sharp.