Worms 4: Mayhem is a 3D artillery tactical and strategy game in the Worms series. 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 a new feature called "The Weapon Factory". The game also contains a shop where players can buy various items, using points won by completing story missions, challenges, or unlocking trophies. (wikipedia.org)