This book with tens of hours of fun inside makes a great gift!. A Huge Supply of Classic Sudoku Puzzles Have fun Sudoku has been called the Rubik's Cube of the 21st century. It is a puzzle based on logic and numbers. Still, it is not necessary to be a mathematical genius, but only logical reasoning and patience. Sudoku is a valuable exercise, a combination of relaxation and mental training that significantly improves the mind's memory and freshness. Benefits of Sudoku: Delay brain aging Improves memory Improves thinking skills and logical thinking Improves concentration Helps to reduce anxiety and stress Promotes a healthy mindset Gives a sense of accomplishment It is an affordable hobby Sudoku Puzzle Book Features: Including all solutions for checking and cheating :-) Loads of Sudokus Plenty of Space: 1 Puzzle per page Perfectly Sized Large Print: one puzzle per 8.5" x 11" page with plenty of room to work Wide inner margins so you can easily tear pages out. Clear structure Premium Matte Color cover design This collection of puzzles will keep you busy for hours! Super gift for young and old!