Easy to read. Each puzzle has only 1 solution. 250 puzzles of gold level. Wide inner edges allow recording of solution options. Ideal gift for all fans of puzzles. Sudoku 6x6, separated by smaller rectangles of 3x2 cells. It is necessary to fill empty cells with numbers from 1 to 6, each of the digits should appear only once in each line of the 6 x 6 square, 6 x 6 column and 3x2 rectangle. If the numbers in neighboring cells differ by one, then there is a white dot between them. If in neighboring cells one number is twice as large as another, then the cells are separated by a black dot. Between the digits 1 and 2 there may be a point of any of these colors. No matter what figure of the playing field we take in all the cells around it (horizontally, vertically or diagonally) there is no such figure. This means that for any randomly taken square 3x3, the central figure of this square occurs only once in it. Excellent purchase for fans of Sudoku. 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. I would also be very grateful if you could write a review. Thank you. Best regards, Andrii Pitenko