Heyawake exampleRules: Shade some cells such that no two shaded cells share an edge, and that the cells left unshaded form a single connected region (that is, they form a single polyomino). Additionally, no continuous vertical or horizontal line of unshaded cells may cross over two or more region borders. A clue tells how many shaded cells there are in its region; unclued regions may have any number of shaded cells, including none.

This puzzle type was invented by Nikoli.


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