By deleting one part from the picture, you get a completely different and absolutely new situation. The game encourages you to think carefully which part is not necessary. Maybe, you think that is it hiding something? Or, maybe, you are pretty sure that the issue depicted on the image will be resolved if you will remove something? Try playing this cool game and have fun. If you are not sure that you can guess which part is not necessary here, then just move your finger on the screen randomly and it will disappear.