- 250 exciting, exciting 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. - each Sudoku has a unique solution - tasks are conveniently located - large print - develops memory, logical thinking, helps with concentration - 2 puzzles per page - wide internal fields allow you to record your decisions and thoughts - very convenient and practical - expands creative thinking - Perfect gift for all fans of puzzles. Two proven sudoku 9x9 have a joint unit 3x3. In total, there are 153 cells for numbers in one Sudoku. Empty cells must be filled with numbers from 1 to 9. Each of the digits should appear only once in each row of the 9 x 9 square, 9 x 9 column and 3x3 square. A great book for relaxing in your spare time. The book has 148 pages. The format is 8.5 '' x 11 ''. I hope you enjoy my book. This Sudoku will provide you with rest, color your leisure time, transform your free time into relaxation, give rest from everyday to 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