Playing Sudoku has several beneficial effects for the player: Improves memory function; Improves logic and reasoning function; Enhances swift decision making; Reduces hesitation of action; Improves focus and concentration; Increases happiness through achievement and sense of accomplishment; Aids relaxation; Provides a form of escape; Reduces stress and anxiety; Improves problem solving skills; Improves strategy and planning skills. With all these benefits in mind, enjoy working your way through the hundreds of Sudoku puzzles within this book, starting with the easy level puzzles, and then moving on to the medium level. Then try challenging yourself further with the difficult level puzzles towards the end.