The books contains 200 Girandola Sudoku puzzles 9x9 at the level of Very Hard. 2 puzzles per page. All riddles have only 1 solution. Perfect for Advanced players.The font size is correct, you will not have to strain your eyes when solving puzzles.High quality paper and print (all puzzles read well, easy to write with pen and pencil without worry of bleed-through). Girandola is an ordinary sudoku with one extra group of cells. This group must also contain digits 1 through 9.