Pebble Universe - you will find a fascinating arcade tells about the life of funny little pebbles. To meet the world invaded by the evil black king. He sows evil and discord. But the brave stones have found a way of dealing with it. Facing each other, their hats fly numerous fragments that fall into the black king's army and destroy it. Than the sighting and the stronger the blow, the more black soldiers to destroy! Ie your task is to correctly calculate the direction of movement of the stones a