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 light up all the squares in the grid by flipping combinations
Click in a square to flip it and some of its neighbours. The diagram
in each square indicates which other squares will flip.
Select one of the 'Random' settings from the Type menu for more
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(last modified on Wed Jun 5 01:47:27 2013)