Tilt Ball Dodge Walls

This is a game where you hold your smartphone flat and tilt it to roll a ball and keep dodging approaching walls.
If the ball hits the edge of the screen, you're out.
The wall gets longer and longer and approaches faster and faster.
The number of walls you avoid is your score.
(You will get points if the wall disappears completely below the screen.)
You cannot play this game on devices that do not have a tilt sensor.
Depending on the model and type of tilt sensor installed, the ball may not move smoothly.