Sudoku is the perfect number puzzle for you.

This book is the first book in the "THE Everyone's Sudoku" series, and explains in detail the basic rules and solving methods of Sudoku so that even beginners who are just starting out with Sudoku can easily solve them. The problems are divided into Level 1 (Beginner), Level 2 (Intermediate), and Level 3 (Advanced) and are marked with the number of stars (★) for each level.
By solving problems of varying difficulty, starting with easy ones and progressing to solve them, you will be able to develop your problem-solving skills while feeling confident and accomplished.
《THE Everyone's Sudoku No. 1》 is a Sudoku for everyone. It is designed to be portable and can be used anytime, anywhere, regardless of time or place, such as on the way to and from work or school, breaking away from the heavy and large conventional books.
I hope that by solving each problem one by one, you will develop your problem-solving skills and be able to approach life's challenges with more confidence.