Close all the open eyes. The game is over when all be a'sleep. Clicks are expensive. Use only few clicks.
When you click an eye it will change in shape.
Three identical eyes a'cross may close. Three identical eyes down may close. When you click the red square the eyes will close, but you loos a few points.
Click a closed eye and it will open, but it is expensive. It might happen that the game itself open a closed eye, that is tricky.