All themes in Lightning Link/Cash as well as Dragon Link share Hold and Spin feature. It was the feature that set them apart when they first came out in casinos. The Hold as well as Spin feature by spinning three times trying to land at least another one when you hit the number of balls (the symbols could be found of different themes that match the theme of the game, however most players simply call them balls as they all do exactly the same thing). If you get lucky you get six balls, the spin count begins at three and you try to get more.