In Homescapes Hacks, puzzles become more difficult later. That's why you can not get this star right now. You can always redo some puzzles where you have no stars. This is because playing the puzzle requires a heart and if you fail that puzzle, that heart will disappear and you will have to wait for it to regenerate. Repeat the older puzzles once you have enough hearts so that you can get that star rating at the end and get Free Homescapes Coins And Stars.