from Simon Tatham's Portable Puzzle Collection
doesn't provide a feature that the puzzle code requires (such as
These puzzles have been successfully run in Firefox 19, Chrome 26,
Internet Explorer 10 and Safari 6.
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
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.
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