Palace Library Escape Walkthrough by Valérie(escapegame24).

1- Zoom on the drawers on the left and open it. Take the second, third, fourth and fifth stamps.
2- Zoom on the statues and place stamps on it according to the hint in their eyes.
3- Zoom on the lower shelf and take the brown book.
4- Zoom on the upper shelf and move the middle books to reveal a button. Press it.
5- Zoom on the table and take the feather.
6- Zoom on the clock. Set it up to 5 o'clock.
7- Zoom on the safe that appeared up on the wall. Set it like a clock at 5 o'clock and press right button. Then set at 9 o'clock and press the left button.
8- Take the red book and set the buttons inside the safe according to the hints in both books. (answer below) Take gold key.
9- Zoom on the map. Color the white key white in blue with the feather, and place gold key in it. Take it back.
10- Zoom on the door and use key. You're out!

In the safe:
OXX
XXO
OXO