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Easy on Your Eyes, engaging for your brain! Do you want to have a clear and trained mind even if you are already no longer very young? 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 Thanks to its large print, this Sudoku is specially designed not to strain your eyesight too much. Its increasing level of difficulty is perfect for gradually developing cognitive functions. So don't worry, if you are no longer in your twenties, or if you are a Sudoku beginner, we will guide you step by step through the beautiful world of Sudoku. Sudoku Puzzle Book Features: Including all solutions for checking and cheating :-) Loads of Sudokus: 100 Hard, 50 Diabolic Plenty of Space: 1 Puzzle per page Suitable for all Levels: Expert to Master 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! If you are ready to rediscover the mental freshness of your twenties, Scroll Up and Click Buy Now!