A ball is bouncing inside the circle and you have to make sure it keeps doing so! Note that the ball will only bounce if it hits the part of the circle with the same color. 4 parts of the circle have 4 different colors and the ball’s color will also change randomly to one of these colors. So you have to be quick to rotate the circle so that the ball won’t touch the side with the different color! Touch on mobile device or mouse on PC.