An Introduction to Sudoku Challenge brings together 250 carefully arranged Sudoku puzzles designed to take you from comfortable, confidence-building solves to puzzles that demand a little more patience and persistence.

You know the basics. Now it’s time to take the next step.
Starting with 40 Easy puzzles, the book quickly progresses into 100 Medium and 110 Hard puzzles, giving you a steadily increasing challenge from beginning to end. As the grids get tougher, obvious answers become less common and careful deduction becomes increasingly important.