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.

Every NEW SECRET Seed in Terraria 1.4.4 Labor of Love

I know it might be a little late for this but I think it would be awesome if we could get the Chinese designs for the bosses in a secret seed or

Working as Designed - World Generation for Secret Seeds

Secret world seeds - Official Terraria Wiki

Secret world seeds - Official Terraria Wiki

Secret world seeds - Official Terraria Wiki

so i was starting a new world and new character because i was bored, as one does, and got this achievement, any idea why? the seed was 2.2.1.2050408401 : r/Terraria

Working as Designed - World Generation for Secret Seeds

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Secret World Seeds - The Official Terraria Wiki, PDF, Wiki

Best Terraria 1.4 Seeds - Game Rant, PDF, Leisure

Secret world seeds - Terraria Wiki