We have published on the site three versions of the famous game Factory Balls and now it’s time to try Factory Balls 4 one of the most successful releases until today. Factory Balls 4 It is different from the other versions from many points of view. The first aspect noticed by me is improved graphics and the second aspect are the 35 levels of difficulty. Drag and drop a ball over different types of tools to produce the required ball physics. Good Luck!