Try to get the ball in the blue bucket, you start with 3 balls but you can more.
Including extra ball bonus, different pins, etc..
-Control box under the flippers controls them
-Red button left: slide the panel above the goalbucket
-Red button middle: launch a pinball
-Red button right: get new pinballs
Update: tweaked the settings so it should run better on lower end devices.
You can report bugs or problems in the comments;)