250 fascinating puzzles. Levels go on increasing. You can start with a bronze medalist, this is the first 80 puzzles. You can go to the champion, the gold prize - 90 extreme Sudoku. Silver puzzles are in the middle of the book. All riddles have only 1 solution. 2 puzzles per page. Enough space for your thoughts and decisions. Very convenient and practical. Good brain support in shape. Expands creative thinking. Wide internal edges allow you to record solutions. Ideal gift for all fans of puzzles. 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. The sum of all the numbers in the cage must correspond to the number printed in the corner. No matter what figure of the playing field we take in all the cells around it (horizontally, vertically or diagonally), there should not be such a figure. This means that for any randomly taken 3x3 square, the central figure of this square occurs only once in it. A great book for relaxing in your spare time. There are 148 pages. The format is 6 '' x 9 ''. I hope you enjoy my book. 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. I would also be very grateful if you could write a review. Thank you. Best regards, Andrii Pitenko