For those of you who do not know, hidden ending!

[Nettogrof]

That is not hidden. It is known that there are 4 endings to the game. The 3 at the end and 1 at the cell near the end. Alexander tells you to stay there and the shadow will kill you saving the rest of the castle and himself. It is true though that it is not that widely known as an ending.

To me, thats hidden. It is hidden because not most players would wait 15 minutes to be killed by the Shadow, and not expecting the game to end there.