Level 455 is the fifteenth and last level in Butterscotch Boulders and the 151st jelly level. To pass this level, you must clear 77 double jelly squares in 19 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.
The colour bombcannons cannot help much because there are only 19 moves, one comes out every three moves, and the wrapped candies come out in every one of the five candy colours. It is hard to create special candies with this many colours.