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Sudoku is a logic game that uses numbers to perform calculations. It originated in Switzerland at the end of the 18th century. At the beginning of the 19th century, the Sudoku game had gradually taken shape. A 9×9 square disk is divided into nine 3×3 small grids. What the player needs to do is to fill the disk with the given numbers so that each row, column, and palace is filled with numbers 1 to 9 without repetition. "Sudoku: From Beginner to Master (2nd Edition)" mainly introduces the rules and solutions of Sudoku, and comes with some practice questions. Also answered some frequently asked questions about Sudoku - are the fewer the clues, the more difficult the problem? Is the most difficult Sudoku really difficult? This book is mainly divided into two parts. The first part is about Sudoku solving, including 15 super practical techniques. The second part is about exercises, including 100 basic solution exercises, 120 advanced solution exercises and 60 advanced solution exercises.