This is an excellent starter book of puzzles, the right choice for a child's first introduction to sudoku, good activity that reinforces logic and problem-solving, this book is perfect for road trips or anytime you need some peace and quiet without resorting to turning on the TV. Benefits: Great way to keep a child busy and entertained! Really good for children to start to learn sudoku. Good way to increase child's learning without feeling pressured. Great book for kids who love numbers. Great product that is portable and doesn't require an electronic device. 300 Sudoku: The first section uses the numbers 1-4, the second section uses the numbers 1-6 and the third section is the traditional 9 number puzzle. First page help kids understand the basics of solving Sudoku, with solutions at the end of the book. For seniors: level of Sudoko perfect for mental exercise without suffering the frustration of adult formats.