Aqre

From WPC unofficial wiki

Rules[edit]

Shade some cells so that all shaded cells form one connected group. Regions with numbers must contain the indicated count of shaded cells, and it is allowed to shade over the numbered cells. There may not exist a run of four or more consecutive shaded or unshaded cells horizontally or vertically anywhere in the grid.

(Rules and example from WPC 2023 IB)

History of the puzzle[edit]

Invented by Eric Fox (USA). The first Aqre puzzles were posted to the Cracking the Cryptic Discord server in October 2020 before eventually being ported to Eric's blog.

The name Aqre (pronounced "Ay-kur") originates from English word acre (a unit of land area), combined with the author's favorite letter Q.

Variants[edit]

Borders[edit]

First invented by Discord user Shye. This variant combines Aqre with the borders rule seen in other types like Tapa.

Shade some cells so that all shaded cells form one orthogonally connected area. A pair of cells separated by a bold border must contain one shaded cell and one unshaded cell. There may not exist a run of more than three consecutive shaded or unshaded cells horizontally or vertically anywhere in the grid.

(Rules and Example from WPC 2022 IB)

Symmetry[edit]

First appeared in WPC 2023/Round 11, though its origins possibly predate this. Author of the puzzle was Jamie Hargrove (Canada).

Standard Aqre rules. Also, some regions have a circle in their center. In these regions, the shaded cells must have 180° rotational symmetry around the circle of the region. There is no restriction on regions without a circle.

Appearances in the past WPCs[edit]

References[edit]

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