To make this tutorial more dynamic, I will break the chapter into parts.

Beginning When you start, make your first move downstairs and as soon as you hit the switch, head upstairs to get the key and exit through the door to the right of the starting room. In the next room you must also press a switch. In this part it is very important not to be scared by the shelf and keep moving forward, trying to memorize where the shelf falls. Continue up the room until you reach the first phone.

First Phone As soon as you can press "e" to be able to use the phone and then spam "F" until it rings as the phone hangs up. From here, follow the paths below until you reach the code room.

Code Room Approach the panel and enter the code 52371. As you do, walk over to the bookshelf. When it opens, keep trying to get into the hole in the bookcase until you can.