My Best Mathematical And Logic Puzzles: Hanare Puzzles (Paperback) (ISBN-13: 9781792834622)

Hanare ("Hanaregumi"; from Japanese, literally "family pair") is a logic puzzle. A square or rectangular grid is divided into regions. The aim to place a number into each region. A number is equal to the size of the region. The distance between two horizontally or vertically neighbouring numbers must be equal to the difference of these numbers.

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