ok, so i noticed that i was playing angry birds and i dont say yes to any of the pop up offers that appear. (its angry birds seasons to be precise), as well as tap tap revenge, and anyway, my credit was continuing to go down. so i played other apps and checked my credit and some of them used my credit as well. so i deleted the ones that took up my credit. how do i know which ones will use up credit and which ones wont?