Worms 4: Mayhem is a follow-up to Worms 3D. It is a turn-based artillery variation with hilarious themes and armaments, in which players command little armies of worms, similar to its predecessor. The gameplay is identical to the previous game, with the addition of a more developed Story mode in which the player collaborates with the wise Professor Worminkle, who can travel to different time eras such as the American Old West, ancient Arabia, and the Prehistoric Age using a time machine.
Players can dress up their worms with helmets, glasses, facial hair, gloves, and other accessories in this installment. A new “Weapon Factory” mode has been added, allowing users to create weapons. The game also has a shop where players can use their points earned by completing story missions or unlocking trophies to purchase various things. New maps, accessories, clothes, character voices, and other products are available in the shop.