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Popping candy is carbon dioxide trapped under pressure inside hardened sugar. As the sugar dissolves the gas escapes, which is where the noise comes from, and it means this bar does something no other chocolate does: it makes a sound after the chewing stops. The gas is also the fragile part. Popping candy only works while the sugar stays sealed, so it has to be coated or kept away from moisture inside the bar, and a bar that has been warm and re-set often loses the effect entirely. The jelly pieces are the other unusual inclusion. Soft, wet sweets in chocolate are difficult for exactly the same moisture reason, and putting three textures in one bar is most of what Marvellous Creations is for. It's the busiest thing Cadbury makes.