- 250 exciting sudoku puzzle- level of the silver medalist- each Sudoku has a unique solution- tasks are conveniently located- large print- develops memory, logical thinking, helps with concentration.Sudoku is useful at any age for developing mental abilities and maintaining them in perfect condition.Sudoku 9x9, separated by smaller rectangles of 3x3 cells. It is necessary to fill empty cells with numbers from 1 to 9, each of the digits should appear only once in each line of the 9x9 square, 9x9 column, and 3x3 rectangle. Cells with even numbers are marked with a gray background with odd-white color. Contains a pattern of squares or rhombuses. All rhombus lines (squares) should not contain duplicate numbers from 1 to 9. 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. Sudoku will provide you with relaxation, color your leisure, turn your free time into relaxation, give a vacation from the day 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 Pitenk