Secret world seeds - Official Terraria Wiki

Secret world seeds are world seeds which have been discovered as secret easter eggs that generate worlds with strange or unique features. Unlike regular world seeds – which only affect the usual world structure – secret seeds can produce worlds with characteristics that would not be attainable through normal world generation (i.e., they can affect the game's mechanics while playing in that world). For instance, they may change enemy statistics and behavior, item drops, graphics, theme music, and more.

Terraria: Secret Seeds For Unusual Worlds

World Seed - Terraria Wiki

Best secret world seeds for Terraria 1.4

Steam Community :: Guide :: Terraria 1.4.4+ - A Guide to 100% Achievements

Working as Designed - World Generation for Secret Seeds

Secret seeds now have unique icons in the World Select menu! : r/Terraria

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Remix Secret World Seed Guide for Terraria 1.4.4 - KeenGamer

A full exploration of the Dream SMP Minecraft seed

Glitched World? : r/Terraria

Working as Designed - World Generation for Secret Seeds

2023 Terraria power glove fiery not

Remix Secret World Seed Guide for Terraria 1.4.4 - KeenGamer

Remix Secret World Seed Guide for Terraria 1.4.4 - KeenGamer

Terraria: All Secret World Seeds Guide (1.4.3)