"CelebrationMk10" is a secret seed introduced to celebrate Terraria's 10th anniversary. This video briefly covers the characteristic of said world seed.
The following seeds can be used to generate an anniversary world (case-insensitive):
celebrationmk10, 05162011, 5162011, 05162021, 5162021
Outro Song: Nosaj Thing, Pretty Lights - Ethereal
#Terraria
![](https://i.ytimg.com/vi/Y8X9Av7PHRk/maxresdefault.jpg)