Fill the grid with black and white circles such that the black and white cells both occupy an area consisting of vertically or horizontally adjacent cells. No 2x2 area is completely black or white.
Solution code: The fifth row from left to right, S for black, W for white.
on 10. December 2015, 08:35 by Statistica
Toll. Und sogar noch eines mit nur sieben Vorgaben ;-)
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