Each puzzle can be solved by nothing more complex than simply scanning the 28 rows, 28 columns and 28 7x4 boxes, without having to make any pencil mark notes. Guessing is never needed, and there is a guaranteed unique solution.
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Book Description Paperback / softback. Condition: New. This item is printed on demand. New copy - Usually dispatched within 5-9 working days. Seller Inventory # C9781491094853