Candy Crush Saga was catalogued by the UXP2 Lab over its level difficulty. According to the entry, the game occasionally gives players levels that are impossible to complete in order to urge them to buy power-ups or extra lives, and if the player does not make a purchase, it slowly decreases the difficulty in order to retain playability.
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Candy Crush Saga: Impossible Levels.
“The game occasionally gives players levels that are impossible to complete in order to urge them to buy powerups or extra lives. If the player doesn’t purchase anything from the game, it will slowly decrease the difficulty in order to retain playability.”