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.
Try to get the whole grid to be the same colour within the given
number of moves, by repeatedly flood-filling the top left corner in
Click in a square to flood-fill the top left corner with that square's
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