As physical activities are important to keep up with our physical health, likewise cerebral activities such as playing chess, poker, puzzles, etc. are important to keep up with our brain health. Do you know that scientists at Western Washington University found that playing Sudoku helped people get those earworm songs out of their heads faster by providing a healthy distraction. Earworm is a sticky song that continuously occupies your mind even after it is no longer being played. Do you also know that the American Alzheimer''s Association has endorsed Sudoku as a BRAIN GAME that might help reduce the risk of Alzheimer''s disease, and some researchers believe that playing mentally stimulating puzzle games like Sudoku might be a good way to reduce our risk of dementia as we get older. This book contains 1200 Sudoku puzzles with 4 difficulty levels, which are 360 Easy, 360 Medium, and 360 Hard puzzles of grid size 9X9. For our serious Sudoku lovers like you, we have designed 120 Extreme puzzles of grid size 12X12. We have come up with gradual difficulty progression so you can easily hone your Sudoku solving skills. Answers to all the puzzles are at the end so you can crown yourself a champion with a feeling of mastery and accomplishment. If you are a novice and not good with numbers try solving easy Sudoku. You may find Easy puzzles hard in the beginning but as you keep on solving your brain will crave more and more as your pattern recognition skill rises. You''ll be an expert Sudoku puzzle solver by the time you finish this book. Solve Sudokus before going to bed to give your brain a challenge, it also relaxes your brain to get rid of the day''s news events by bringing a sense of calm and order. No matter how busy your life is, Sudoku offers a relaxing way to take a break from the world around you. Many people make Sudoku a part of their daily schedule because it refreshes them and allows them to meet the other commitments with renewed energy and reduced anxiety. Solving Sudoku may offer you: An excellent and affordable brain training tool. Wonderful way to keep the elderly and kids busy. If you want a few hours of peace and quiet? Get this book for your spouse. Minimize your electronic screen time. Boosts logical and quick-thinking skills. Great mental exercise to improve memory and recall. Helps you to focus and increases your concentration and brainpower by keeping your mind sharp. Sudoku requires players to think strategically and solve problems creatively. If solved together, Sudoku helps develop social skills such as interpersonal intelligence. You will learn how to make a decision and take an action with less hesitation. Sudoku provides healthy escapism by reducing overthinking. Hours and hours of amusement with never-ending Sudokus. Every page comes with an allowance for tearing out a page of puzzles to take or share with other family members. Fun gift and entertainment for the whole family, which promotes healthy competition. There are only six puzzles per page, and the puzzle boxes are large enough to write more than one number to try out some combinations in any box, also the large font makes puzzle solving enjoyable without eyestrain for people who have trouble seeing like seniors and people with diseases like macular degeneration. The book is made with high-quality thick paper for erasing without tearing the paper apart and the quality paper allows frequent corrections and it does not get scratched easily. People who bought this book found it much handy to use even if it is not spiral bound. So if you really want to energize your brain and want to attain next-level intellect then click ''Add to Cart''. Your sweating brain will love you for sure.