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. In this puzzle, the numbers from 1 to 6 do not repeat also on the two main diagonals of the large square, marked by dashed lines. 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