A super hard level is a level on Candy Crush Jelly Saga that is considered difficult by the majority of players and is often much harder than the levels marked as Hard Level, it means the player needs to find the solution to clear the level.
Super hard levels are introduced on May 20, 2017.
If a level is deemed a "super hard level", it will have a special icon on the map.
For the list of super hard levels, see here.
It has a blue level icon with a skull along with two horns under it.