Crashes frequently under iOS 15.1
It’s an addictive enough game and very challenging but frequently crashes when you tap the final difference location. It freezes and you don’t get any free help rewards. Further, it often places completed images back into the unfinished folder and you have to start that image from scratch. They need to make it far more stable. There are far too many commercials between images too. You often have to waste several minutes before being allowed to select a new image.