I have 30 out of 31 endings and I edited my post so there's a list of the endings I remember. You have to click "view rest" because I added some empty lines so I won't spoil the game. I just can't find that one ending.
In the 3rd room, have you tried to rush directly without solving the lock?
I just tried it and it looks like I tried it before but forgot, the number of endings didn't change.
