Easy to read. Each puzzle has only 1 solution. 250 level puzzles Gold. Wide inner edges allow recording of solution options. Ideal gift for all fans of Sudoku. Excellent purchase for fans of Sudoku. Each Sudoku has a unique solution. Very large stock of classic Sudoku puzzles. On each page a lot of space for records and solutions for solving puzzles. A lot of difficulties on each page, you'll move around an interesting way of thinking. Sudoku will provide you with relaxation, color your leisure, turn your free time into relaxation, give a vacation from the daily for your mind, add zest, develop memory, develop logical thinking and concentration of attention. All answers are carefully checked and are at the end of the book. Sudoku will support your mental abilities in perfect condition. Thank you. Best regards, Andrii Pitenko