It goes up to 3rd level(by default) when the victim will see scary face+sound+vibration:). If 3rd level is too complicated you can configure "scary level" or ball sensitivity in game settings.
This is analog of the famous scary maze game.

The game automatically starts to record video using device's front camera in background when "scary level" starts, and saves the file on sdcard(/sdcard/Movies/MagicMaze). In case if there are no front camera available, it will just record using rear camera(at least you will be able to hear the voice reaction:).

P.S. beware that you are responsible for the bad consequences(in case some one throws away your phone and break it)