* Change the text "Rating" on the page where you choose the stars to "Difficulty rating" if that's the intended meaning. (In that case I'm also not sure if this information, that is based on other contestants solves, should be available before you finish the puzzle.) If that is not a difficulty rating, then it is also not clear what exactly do you want, since a lot of popular sites (like Grandmaster puzzles and the Logic Master Germany portal) uses a star ranking for difficulty and there is already emojis to describe the puzzle.
What we intend is quality rating. I see the words "quality rating" wherever stars are asked. Can you specify where you see just "rating"?