Many different special Dots can damage a Paper Box, including:
• Explosive Dots: Beetles, Nesting Dots, Pinwheels, Lanterns, Gems, Crab Dots, Thunderclouds, Moonstones, Hedgehogs, Geodes, Sun Dots, and Enchanted Dots.
• Targeting Dots: Fireflies, Mushrooms, Bouncy Balls, and Octo Dots.
• Moving Mechanics: Minecarts and Meteors.

Note: Fire does not have any effect on Paper Boxes!