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Sour Skull is an upcoming blocker in Candy Crush Saga.
Properties
Skull Pedestals, on their own, cannot be damaged. To remove them, you have to make matches next to the Sour Skull, which moves to a different pedestal each time it is hit. Sour Skulls have five layers, and when the skull is removed, so are all of the pedestals. Pedestals can also have other elements hidden behind them, like blockers and ingredients.
Once the Sour Skull is hit, it vanishes for the rest of the turn. It appears on another Skull Pedestal after all cascades have ended on the turn it was hit. Because of this, it is only possible to clear one Sour Skull layer per move.
When a Skull Pedestal flashes, it means that it will be the one that the Sour Skull will be on next time it moves.
The concept of this element is similar to the Toffee Tornado. However, it can move in a fixed position (it can only move to other skull pedestals) and only when hit. Toffee tornadoes, meanwhile, can move to almost any random tile every move (every two moves after being nerfed). Also, Skull Pedestals flash to let you know which one the Sour Skull will be on next time it moves, while Toffee Tornadoes don't given any indication as to which tile they will move to next.
Like Sugar Chests and Order Locks, the skull pedestal is an encasing blocker that can only be removed by clearing a certain element.
According to at least one level in the latest Tiffi and the Beanstalk event, Sour Skulls can be required for candy orders which is the code 34.