During the second half part of episode 5 of Life Is Strange, you are locked in the bathroom in the diner, and need to find a 4-digit code in order to get out. There are codes scattered all over all the walls in the bathroom, so how do we find the correct one?
The answer to the puzzle is to look in the mirror. You will quickly realize that the walls are no covered with these codes in the mirror, except for a single one. And this one is the correct one to open the door with.
If you don't want to look for yourself, see below to get the code. And if you don't want to be spoiled, stop reading.
The code to open the bathroom door in episode 5 of Life Is Strange is: 0311.
Just type that into the lock and the door to the diner will open up.