Daily puzzle (2021-10-19)


Yin Yang

Author: Vladimir Portugalov

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Fill every cell with either a black circle or a white circle. No 2x2 square of cells can be entirely filled with circles of the same colour. All cells filled with the circles of one colour must form a single edge-connected region.

Example puzzle

Grid control: Click the mouse button at the selected cell to change the color of the cell. More details about grid control are at the help page.