Draw on Edges: OFF Panel: OFF

     

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1. The grid is divided into nested rings. The rings are identical in structure and clues and extend inward and outward to infinity.
2. Shade some cells so that no contiguous set of shaded cells is completely enclosed by unshaded cells. I.e. a contiguous set of shaded cells continues to infinity in at least one direction.
3. All unshaded cells form a contiguous set. I.e. between any two unshade cells there must be an orthogonally connected path over finitely many unshaded cells.
4. A cell with a number is unshaded. The number indicates the number of unshaded cells visible from the cell with the number in a straight line to the east, south, north and west. The cell with the number itself is counted once and shaded cells obstruct the view.
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Surface