I expect ads, that's fine. But more and more I'm getting an ad that won't let me go back to the game after it's run its course. Ad plays, then there's no X to come out of it, can't use the back arrow, I have to keep stopping the app to get back to game play. Please don't respond by telling me there's an option to pay for no ads - I understand a free game will have ads - but you're losing avid players by having an ad stuck on the screen with no easy out.