Game, Can you figure it out?

1

Okidoke, if you go to orisinal.com. You can find many games with a character with mouse follow. But it also stops when the mouse is in the equal position as the middle of the screen. I guess what Im trying to say is not only if you put your mouse over the character, it’ll stop but it will also stop if you put it ABOVE IT. It always know which way it was facing and gets it to stop facing that way. How did they do it?