You need to drive the white ball to the walls and avoid collisions with the red balls.
You can drive it by touching the screen. The white ball changes direction at the point where you lift your finger.
Every time you hit a wall you get a point. However a red ball is initialized in the middle of the distance covered since your last touch or the last wall-hit.
As every time you change the direction of the white ball, a red ball is initialized you should avoid changing directions many times.
Find the best way to make the white ball hit the walls without changing its direction.