Corners

The instructions are pretty simple: tilt your phone in the direction you want the bars to move.

If you can't figure out the objective, I would highly recommend seeking professional medical help.

Just kidding... But not really... Just don't let the ball leave the board.

Also, I'm not responsible for how much time you waste trying not to let that happen (I'm looking at you, Bobby).

And yes, I am well aware that a more accurate name would be, "Edges," but you can kindly take that thought and leave it somewhere no one would be willing to go looking for it (I'm still look at you, Bobby).