No Four in a Row puzzle book for Adults: 200 Medium to Hard Puzzles 7×7 (Volume 5)

The book contains 200 excellent No Four in a Row puzzles 7×7. Medium puzzles 100 Hard puzzles 100 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.High quality paper and print (all puzzles read well, easy to write with pen and pencil without worry of bleed-through). No Four in a Row is played on a rectangular or square grid. Some cells of the grid contain ‘X’ and ‘O’.The task is to fill in the grid so that four consecutive identical symbols never appear in any row, column or diagonal.