How to open the bronze port at first floor?

Question

I just finished the first floor and found this big bronze door. I have no idea how to open it, do you have any hints?

I found a strange small rock on the right wall, but nothing happens when I click it.

Asked by Drake

Answer

Hint:

There is another "strange small rock" in the room. Keep looking at the walls for it (as you should look for them throughout the game).

Answered by DJ Pirtu

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