250 excellent puzzle 9x9 at the level of Hard. All riddles have only 1 solution. 2 puzzles per page.The font size is correct, you will not have to strain your eyes when solving puzzles.For Advanced Players.High quality paper and print (all puzzles read well, easy to write with pen and pencil without worry of bleed-through).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.