Цитата допису Laure.Noobieland YT:

Has someone found how to open the crawlspace because seems like we have a secret ending by putting the bones down there but I've tried with the crawbar and it doesn't work, and haven't found any other key or something yet. Maybe we have to beat the hard or nightmare mode ?

The crawlspace is not currently available for access. It will be accessed with the Joseph update at the end of the month along with the 3rd ending that is hidden on the achievement page. I did not know that the hidden achievements could be viewed and I finished up making the achievements already so I decided to hide it. My mistake!

Ow okay, thank you for your answer. So let's wait for Joseph's update