from Simon Tatham's Portable Puzzle Collection

Sorry, this Javascript puzzle doesn't seem to work in your web browser. Perhaps you have Javascript disabled, or perhaps your browser doesn't provide a feature that the puzzle code requires (such as typed arrays). 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 of them.

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 varied puzzles.

Full instructions | Back to main puzzles page

(comments to anakin@pobox.com)
(thanks to chiark for hosting this page)
(last modified on Thu Apr 27 01:47:39 2017)