The color red in the 'The Red Room' is a significant element contributing to its scariness. Red is often associated with blood, danger, and passion in our subconscious. So, just the name of the room sets an uneasy tone. The isolation of the room within the building also plays a part. It's like a little pocket of mystery and fear. And the noises, whether they are real or just in the protagonist's head, add to the overall spooky atmosphere. The way the author describes the room as if it has a life of its own, almost as if it's a character waiting to devour the protagonist, is really what makes it such a scary story.
One important element is the build - up of suspense. As the story unfolds, there are small hints and strange happenings that gradually increase the tension. For example, the flickering of lights or a cold draft that suddenly appears. Also, the psychological state of the protagonist is crucial. Their growing fear and paranoia as they stay in the red room are contagious and make the reader feel scared too. And let's not forget the possible supernatural elements. If there are ghosts or otherworldly beings hinted at, it definitely amps up the scariness factor.