The Terraria Hacked World APK helps you to create Terraria world and allows the game player to use their custom settings and generate world according to its own requirement.
When you create the world with Terraria Mod APK there is a seed regardless of settings. It will allow you to see, copy and input the settings. If a seed is not entered manually during world generation, a seed is automatically generated randomly.The Worlds are generated before the latest version of Terraria will never have a viewable seed. It was generated with a random seed, that information is simply lost as it was not stored in the world file.
But in the latest version, you can see your seed.