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Colour every square either black or white.
Each number indicates how many black squares are in the 3×3 square
surrounding the number – including the clue square
itself.
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. You can left- or right-drag to set multiple
squares at once.
Full instructions
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(last modified on Mon Mar 9 01:42:11 2026)