3. Now press the wooden panel that slides up and put the curtain rack to hold it up.
4. If you look at the symbols on the door, you can see the middle symbol has dots. That's the positions of the levers. Look at the levers on the green area.
1st lever: far bottom
2nd lever: 1 above the far bottom
3rd lever: leave it where it is
4th lever: down 1
The green light will light up above the levers.
7. The first symbol in the book are the pills.
Since row 1: left and row 2: right pills are missing, these are the first two buttons you press.
The second symbol in the book are the windows. You can see that the far bottom right window is broken.
This is the third button.
Finally, the last symbol is the green light. The only button that relates to the green light is the middle one so that's the last button.
Here are the orders of the buttons:
Row 1: Left
Row 2: Right
Row 3: Right
Row 2: Middle
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8. Proceed to the next level!