Level 1220 is the fifteenth and last level in Marmalade Moon and the 574th jelly level. To pass this level, you must clear 33 single and 37 double jelly squares in 45 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.
There is no difficulty in earning two and three stars as the two and three star target scores are only 20,000 and 30,000 points respectively. The jellies are worth 73,000 points which is more than the two and three star score requirements.