Level 2448 is the thirteenth level in Haystack Hills and the 874th jelly level. To pass this level, you must clear 4 double jelly squares in 24 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.
You can get one more key to unlock jelly fish, but there probably won't be sufficient moves to get past the frosting and match the fish anyway. Plus, five colours make it hard to break the frosting and make special candies.
The jellies are worth 8,000 points.[1] Hence, an additional 2,000 points is required to earn one star.