A secret complex level found in Split Fiction
By pressing a tricky combination in the elevator, you can get to a secret room with a challenge in the Isolation chapter, which only a few developers from Hazelight could manage to complete.
If you can pass this level, you will be rewarded with a video message from Josef Fares. The developer specifically noted those who posted their completion of the secret level on YouTube, stating that they do not deserve praise and should accomplish this challenge on their own.
Fares also promised the first person who proves to him in person that they completed the secret level:
