You Must Escape Level 13 is another addition to this challenging puzzle game from mobest media. There are two new levels; 13 and 14 but I will only discuss the solutions to level 13 in here and the guide for 14th will be covered in another post.
Written guide:
-Pick up one stick of wood from the telescope's tripod and another one from the white board on the wall.
-Put those sticks of wood on to the ladder leaning on the bookshelf on the right side of the room.
-Go up the ladder and pick up the knife.
-Use the knife on the eyeglasses on the table to get one of its lens.
-Use that lens on the eye piece of the telescope to reveal the secret code (USA).
-Use the USA code to open the drawer then get the piece of cloth from it.
-Pick up the bottled liquid solution and in your inventory, combine it with the piece of cloth.
-Use the now wet piece of cloth to wipe the writings on the whiteboard to reveal the hidden code.
-Use that code to open the secret compartment on the shelf with numbered books and get the screwdriver.
-Under the shelf where the ladder is leaning on is a concealed key. Use your screwdriver to unscrew the cover and finally get the key.
-Open the door and then you are out.
Here is
You Must Escape App Level 13 walkthrough video demonstration if you need more spoilers.