Example puzzle

This is an example puzzle. You can solve it the same way as you would solve competition puzzle, but result never stored. You can reveal an answer for the puzzle by clicking "Show answer" link.

Yin Yang

Author: Andrey Bogdanov

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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 filling of the cell. More details about grid control are at the help page.