Giving due credit, dev's current reply is fair and polite. Latest update put an ad in the middle of a game. I don't mind ads before or after but not while my brain is working... Due to the developer's original response from what it's been edited to now, I am uninstalling the app. As stated, perfectly happy for ads before and after games, but not during. Developer originally decided to respond as if I didn't realize where their revenue comes from. Plenty of other sudoku apps to choose from.