250 level puzzles Silver. Excellent purchase for fans of Sudoku. Each Sudoku has a unique solution. 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