The best way to think about it is to consider the diamonds to be "on", and the squares to be "off". When you turn an area on, it, along with all areas around it will flip to either their on or off state. For example, if you were to click on an "on" area surrounded by "off" areas, the area you clicked on would turn "off" and the areas around it would turn "on". Areas that are up, down, left or right of the area you click are considered adjacent.

Your job is to figure out what sequence you need to use to turn the entire board off.

Good Luck!