I no longer have Hidden Level games popping up periodically. Why not?

Do you mean the special levels you get after any game ending in 0 or 5 (like 200, 205, 210, etc.)? Do you close out the app and reopen between games in order to skip the ads? If you do that after a game that ends in 0 or 5, it will not give you the special level. If you mean the ones with the ? in the balls, I have no idea and I'd love to skip those, I hate them! There is no strategy to them, just luck of which ball you select. I'd love to know how to skip them.