Deathloop is full of hidden away easter eggs, references, and generally interesting things to discover. Given the huge scope of the game's maps and time periods, there's a lot you can miss too, and according to one of the game's developers, there's stuff hidden in there that gamers still haven't managed to find yet.
The game was released over a month ago, and usually, everything there is to know about a game will have been found by this point. According to one of the game's level designers, Julien Eveillé, there's something everyone has managed to miss so far, and it's apparently relatively obvious at that.
I know for a fact the Internet didn't find everything hidden in Deathloop so far. There's still one secret thing I want someone to discover. 🤭— Julien Eveillé (@PATALOON) October 6, 2021
The hidden... whatever it is, is likely to be in one of the Updaam region varients, based on Eveillé's contributions to the game and various hints. That being said, he also mentioned that "it's a way bigger consequence to a way bigger event that can only happen if you made it happen. Also, the cause and the consequence aren't on the same map!" so it may require a little more out-of-the-box thinking.
As for what it could be, we have no clue, but we'll be sure to keep an eye on the internet and update the article if we learn more. In the mean time, share your theories in the comments down below!