Best Brain Games: Heyawake Puzzles - 100 Large Print Puzzles (Paperback) (ISBN-13: 9781718098541)

Heyawake (from Japanese, "divided rooms") is played on a rectangular grid. The grid is divided into rectangular "rooms". Some rooms may contain a single number. These rooms must have the designated number of cells painted black. Other rooms may have zero or more cells painted black.- Black cells must not be orthogonally connected. - All white cells must be interconnected. - A line of connected white cells must not connect more than two rooms together.

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