One of the drawbacks is that in order to get extra points to shuffle, you have to watch an ad. Many of these ads will go to a black screen after they play; you can't get out of it, it won't go away. All you can do is exit & go back into the game; you do NOT get your points! I've played over 1720 games of Word Stacks & was #4 in Tournament, which place I LOST bcs of this! I've complained Many times re: this problem, NOTHING is done! When this glitch is solved, I will give this game Five Stars!!