This section contains a complete walkthrough for Call to Arts chapter in My memory of Us. Here you will find a thorough guide for chapter 12 with screenshots. With this solution to My Memory of Us, you will easily beat the game.
First, go to the right and enter the building. Speak with the mister behind the corner, go to the left. You will encounter a big clock with a knob. Use the knob to set the arrows like in the picture below.
On the right from the clock a secret passage will open. Enter it, go to the right, speak with the elder man. He will ask you to find a gearwheel. Leave the building. You will notice that the guard that blocks the passage is leaving. Keep going and walk through the passage with two statues. You will face another music minigame. Hit the correct keys when the sheets appear between the horizontal lines. After the minigame you will receive a bone from the officer. Go back to the previous building and use the door next to the large clock (check the above picture). Go left, walk through the passage to the next room. Get close to the dog and interact. Now, pull the book that is lying on the left side on the shelf. A passage will open. Walk inside and take the key. Go back to the room with the dog and then to the corridor. Go to the right. Use the key at the closet and take the gearwheel. Now, go to the basement, speak with the man, and then walk to the middle of the machine (where the broken gearwheels are lying). Interact. Speak with the man at the machine again. Once the conversation is over, walk towards the button and the lever near the machine. When pages appear under the machine, press the shooting key (by default it is Spacebar). You must repeat this until you succeed. You will receive an achievement for perfect printing. Once you're done printing, go to the right and take the printed posters. Go outside.
Your task will be to place the posters during the night. Look for symbols like in the above picture - they show you where to place the posters. Watch out for the patrols on the ground and in the air. Use boughs, dark cages and obstacles that provide cover to keep going further. Place the posters till you reach the next location. Then go to the next location. There you will have a new batch of places to post the posters. Frequently you will do it under the nose of the guards. At some point you will encounter a patrol with a dog. Run to the left while avoiding the patrols (there will be only ground patrols that are easy to avoid). Don't wait in hiding for too long because the dog might detect you. Go back to the printing room.