Level 2373 is the thirteenth level in Cupcake Clinic and the 129th (128th jelly drop down) mixed mode level.
To pass this level, you must clear 57 double jelly squares and collect 3 cherries in 30 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.
This is used to be the second mixed level without blockers, the first being level 2174. This one didn't have mystery candies, however, so it would be literally impossible for any blockers to appear in the level.
After the buff, it is no longer true since it has multi-layered icing on board.