Gautam Sudoku Matsya (9X9 Variant) Puzzle BookSuitable for: Gautam Sudoku Matsya Puzzle Book is actually ideal for anyone who knows a little bit about and have learnt the basics of Sudoku Solving Techniques or how to solve 9X9 sudoku puzzles. So, it is better regarded as Sudoku for Beginners, Experts, Advanced Players, Elderly, Inmates, Moms, Old People, Seniors, Young Adults and Teens. This sudoku variant is also known as Gattai Sudoku in some part of the world. It is also known as Matsya Sudoku as it resembles the shape of a fish. This puzzle variant is made up of 3 overlapping 9X9 sudoku puzzles which ultimately creates a central 4th 9X9 sudoku due to overlapping portions. So, yes, the person who is trying to solve these types of sudokus needs a little bit of prior understanding and experience of solving the basic 9X9 sudoku puzzles. A must-have for all Sudoku enthusiasts.Specialty: Just One Sudoku Puzzle per Page for a clutter-free & amazing sudoku solving experienceNo. of Puzzles: 100Difficulty Level: Very Easy (50), Easy (50) Benefits of Playing Sudoku Games: 1. It may help boost logical thinking.2. It may improve memory and recall.3. It may help slow down the negative impact of Alzheimer's Disease and Dementia.(N.B.: However, Playing Sudoku should Not be considered as a Medical Treatment Alternative for any physical or mental illnesses. It is just a form of mental/brain exercise and NOT a treatment.)4. It may help to develop quick thinking skills & may improve concentration.5. It may help reduce anxiety and stress.6. It is a great way to improve a child's problem solving skills.7. It promotes a healthy mindset.