Nubla

This is the tenth, and final one of the 10 collectibles. Remember to pick it up using , regardless of whether you already have something in your inventory. It looks like a letter (see the trophy tile).

Once you are in the house, head back towards the door where you entered. The love letter will appear and drop to the floor. It will be slightly obscured, but it's no problem, just a warning. See the video (3:18) for precise location: