I have really been interested in the secret for a long time, yet I cant translate it.
When A Hat In Time was first released, the crator of the game made a new YouTube account (which will be linked at the end of this post)
This account showed creepy A Hat In Time videos, mostly showing the main character standing in one place near a item and a message appearing on the screen sometimes, along with a secret message in the description of the video as well. however I can not translate it since I have no idea what language it is.
There is a secret similar to this, however instead of it being outside of the game, it was hidden right under our backs.
In a specific closet in a specific chapter (forgot which one) You had to use No-Clip to clip inside the closet, once in the closet you had to active the dwellers mask ability and there would be a message, this message is in the EXACT same language as the videos show, yet again, I can not translate it.
If anyone is curious here is the link to the YouTube account: