Level 1715 is the fifteenth and last level in Sweet Skies and the 18th (16th jelly drop down) mixed mode level.
To pass this level, you must clear 18 single and 54 double jelly squares and collect 2 hazelnuts and 2 cherries in 20 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.
This is the first redundant mixed level. The level is designed so that the jelly can't be completely cleared until after both cake bomb have been destroyed and destroying one cake bomb will automatically bring down all required ingredients. Therefore, the gameplay would be identical if this was a regular jelly level.