Worms 4: Mayhem is a 3D artillery game in the Worms series developed by Team17. It is much like its 3D predecessor Worms 3D, except that players can customize their worm's appearance (hats/helmets, glasses, facial hair, gloves/hands) as well as create their own unique weapons in an added feature called "The Weapon Factory." The game also contains a shop where users can buy various items, using points won by completing story missions, activities or unlocking trophies.