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.

Don't dig up - Official Terraria Wiki

i need help what are some really good seeds you know of? : r/Terraria

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

I found a secret seed what does this do : r/Terraria

1.4.3 - Terraria Wiki

Approachable Game Design by AlodoTrobell on DeviantArt

Remix Secret World Seed Guide for Terraria 1.4.4 - KeenGamer

Terraria: Secret Seeds For Unusual Worlds

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Working as Designed - World Generation for Secret Seeds

World - Official Terraria Wiki

Secret world seeds - Official Terraria Wiki