This page of our Little Nightmares 2 guide provides a walkthrough of The Nome's Attic DLC.
The DLC will launch when you get the key in the attic in Chapter 1. A mysterious figure will appear that you will have to chase.
If you want to know how to purchase and launch the DLC, take a look at this page: The Nome's Attic DLC - information.
Remember that Six will not follow you. Climb directly behind the figure so that you don't lose sight of them.
As you're climbing higher, you will see a figure hiding from you. You need to find it for it to show you the way forward. First, all you need to do is to open the suitcase.
Then throw something (e.g. shoe) into a cardboard box.
The next step will be opening the drawer located right next to the suitcase.
Eventually, the character will hide in an armchair. Just jump up on the chair a few times to make it run out, showing you the way forward.
When Nom opens the passage, further run after him to the next part of this floor.
The figure will light a match, which will be the only source of light. You must remember that it only moves when it knows you are watching it. So you have to stand in the corner, by the shelves, and then he will move forward.
While going forward, Nom will get blocked. You need to move the cart so that he can get out.
Then push the metal door so that the figure can run across it.
When you reach the next part of the room, Nom will switch on the lamp. You can pull the lever that will allow you to move on.
Go back to the room, open the drawer and run through the whole route again.
You will reach a hat that you can obtain by owning this DLC.
To get out of the room, you simply have to go through a hole in the wall. Eventually, you will appear by Six's side and be able to continue the main storyline.