Click a cell, and it will change from 'off' to 'on', and back again. [br][br]Easy! But clicking a cell also changes the cells above, below, to the left, and to the right.[br][br]Can you find out how to create the twelve target patterns?

If you'd like to play with the board without worrying about the target patterns, [url=http://www.geogebratube.org/material/show/id/1256]you can[/url].