you should click on the colored small ball and make them whole in the white colors. There are ten levels. And it?s no time limit. All you have to do is to change those balls which in different colors into white colors. You can continue to play the next level by passing your current level. Some time, you click blue or brown ball they change color with another ball that next to it. And in different levels, the direction of the ball change for color is different. The current pattern at the left upper corner can remind you which the direction is changed for.