Introduction

The present book aims to provide systematic and reliable techniques, called the global solution, for Sudoku puzzles. Any proper Sudoku puzzle, which has one and only one solution of Sudoku, can be solved by anyone following the techniques provided in this book.

Specific symbols are introduced to express the 6 basic rules of the Sudoku global solution. As the results, those Sudoku solving techniques are presented similar to the annotations in chess.

Historical Context

Finnish mathematician Arto Inkala proposed ''the most difficult Sudoku puzzle'' in 2007. Then, he designed another difficult Sudoku puzzle in 2012, named ''the thing Everest''.

Content Overview

In the present book, the solving process of those two difficult Sudoku puzzles is illustrated reliably by the specific symbols of the global solution step by step.