Very convenient location. 3 puzzles on 1 page. There is free space for records and solutions. From the middle to the heaviest option. Sudoku for any mood. Excellent purchase for fans and professionals. Sudoku 9x9, separated by smaller squares of 3x3 cells. The entire playing field consists of 81 cells. It is required to fill empty cells with numbers from 1 to 9, each of the digits should appear only once in each row, column and 3x3 square. An excellent book for free time pastime and mind training. Presented 137 pages. Format 8'' x 10 ''. 3 Sudoku puzzle on the page. Conveniently positioned for better perception. 309 unique puzzles. MEDIUM + HARD + VERY HARD. I hope you will enjoy my book. I would also really appreciate it if you could write a review. Thank you. Best regards, Andrii Pitenko