Puzzle Archive

Spiral Region

Shade some cells in the grid below such that the set of shaded cells is connected, has 90-degree rotational symmetry about its center, and contains the same number of shaded cells in each outlined region.

The answer to this puzzle is the smallest possible product of the areas of the connected groups of empty squares in the completed grid.

(Note: This post has been edited 2018-09-04 to change the answer to the smallest possible product of areas of connected groups of empty squares.)