Introduction to Sudoku - 9X9 - Level 5 (10+ years)

This is a level 5 book in the Introduction to Sudoku series. It is designed for readers with a working knowledge of the fundamentals of sudoku, who are looking to master the game. The reader will learn advanced techniques, including how to spot possible entries, which squares to look at first, and how to solve more difficult puzzles. With more than 100 puzzles, your child will have hours of non-stop fun.