Learn how to keep your mind active. Sudoku is a fun logic puzzle with numbers. This is the best game to increase memory, increase concentration and have fun. It helps to develop logic skills and thereby increase thinking. Interior details: - 8.5"x 11", white pages of high quality paper 120 puzzles for clever kids ranging from easy to hard - 40 easy Sudoku puzzles to get a basic foundation of solving skills - 40medium Sudoku puzzles to get a catch with fun and challenging - 40 hard Sudoku puzzles, perfect for the clever and smart ones One sudoku per page with solutions at the end of the book. Large print makes reading accessible. User friendly layout Matte Paperback Cover. Hours of great fun and best to be gifted too.... Click 'Add to cart' to enjoy this awesome copy.