Sudoku Collection: 200 Hard Sudoku Puzzles 9x9

The books contains 200 puzzles 9x9 at the level of Hard. 2 puzzles per page.All riddles have only 1 solution.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). Perfect for Advanced players.The goal of Sudoku is to fill in the empty cells, one number in each, so that each column, row, and region contains each number exactly once.