Identifier: The actual unique random seed. A copied seed can then be input when creating a new world, which results in a nearly identical generated world, provided it is created with identical parameters (same size, same choice between Corruption and Crimson, and same choice of difficulty). On Desktop version, worlds with a seed display a small seed icon in the world list, allowing the player to see that world's seed and copy it to the clipboard. Some secret world seeds (Desktop, Console and Mobile versions) have been discovered as easter eggs that generate worlds with strange and unique features. If a seed is not entered manually during world creation, a seed is automatically generated randomly. Worlds created after 1.4.0.1 will always be able to have their seeds edited upon world creation, regardless of the experimental feature setting. Worlds generated prior to 1.3.4 will never have a viewable seed while they were generated with a random seed, that information was only used during world creation, and was not stored in the world file. In 1.3.4, an experimental feature setting was added to allow players to see, copy, and input the world seed. Worlds generated in 1.3.4 or later will always have a world seed. The World Seed feature enables the display of the random seed used to generate a Terraria world, and allows the player to input a custom seed manually when creating a new world.