Two rings intersect with each other. White ball revolves on the upper ring and the red ball revolves on the under ring.
Your task is to control the speed of the white ball and avoid it collide with red ball. You should control the speed and make the ball revolve more laps. You have to pay attention to that the number of the red ball will be more and more. You need stare at the screen carfully and click it quickly to avoid the collision.