No Four in a Row puzzle book for Adults: 400 Medium to Hard Puzzles 9x9 (Volume 15) - Paperback
No Four in a Row puzzle book for Adults: 400 Medium to Hard Puzzles 9x9 (Volume 15) - Paperback
$21.83
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by Alena Gurin (Author)
The book contains 400 excellent No Four in a Row puzzles 9x9.
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.
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