When launching a new world in Terraria, players typically let the game create a random map for them to explore. However, there is the option to manually input a code or word so that Terraria players know exactly — or at least have an idea of — what they are getting into. This is called the World Seed feature, and, as with the wacky world of Terraria mods and the sheer randomness of generated worlds, the possibilities are almost endless.