It is hard to clear popcorn in 26 moves, but 4 colours and mystery candies make it easier.
Mystery candies can yield lucky candies which can turn into popcorn. On web version, bringing a lucky candy to the conveyor belt and opening it will destroy the popcorn immediately. However, on mobile, doing this will freeze the game, making the level harder.
The order is worth 50,000 points. Hence, an additional 25,000 points is required to earn one star.