Worms appear either with a pink or green colour. They are U-shaped and have faces on the side of their body, and walk with their smiling faces upside down.
Worms can be defeated by hitting them with the angry head of the same colour. They walk back and forth over flat surfaces, reversing walking direction when a non-passable object is made contact with. The pink coloured worm first appears on level three, and the green coloured variation first appears in level five.