While there are no 'key items' to collect, certain environmental landmarks or specific locations act as 'key narrative triggers.' These are points in the environment that, when approached, will cause the narrator to deliver a new segment of his letters. Examples include the shipwreck, the buoy, specific cave paintings, or certain vantage points. These are not physical items you pick up, but rather invisible zones that advance the story. The game guides you towards these triggers through its level design, but exploring off the main path can sometimes reveal additional, optional narrative fragments.
