I tried to play the game but I'm definitely stuck on the left side of the room that needs 4 numbers code but I opened it for a couple of minutes. However, I don't know if there's another ending if I did access the patient's files on the computer (it is still difficult and doesn't have many clues to access) but I got the ending wherein I stabbed Carl (that it should not suppose to be?)
The game was superb and has a lot to offer! I want to explore the whole area of the game soon.