A simple (and potentially very annoying) little puzzle (which I've previously implemented for the Palm Pilot and for GNU emacs), now written in XHTML and JavaScript.

The object of the game is to totally fill the grid with black squares. Clicking on a square results in that square (and those around it as seen in the initial pattern below) toggling its colour. There is a solution in 14 moves. Can you find it without cheating?

Note that the game doesn't do anything when you've "won".