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Colour every square either black or white, in such a way that:
- no three consecutive squares, horizontally or vertically, are
the same colour
- each row and column contains the same number of black and white
squares.
Left-click in an empty square to turn it black, or right-click to turn
it white. Click again in an already-filled square to cycle it between
black and white and empty; middle-click to reset any square to empty.
Full instructions
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(last modified on Mon Mar 9 01:42:11 2026)