One thing that might make it special could be its unique take on horror. It might combine different elements of horror that we don't often see together. For example, mixing elements of slasher horror with supernatural elements.
The specialness of 'Mr Nightmare 3 Horror Stories' could lie in its ability to tap into universal fears. It might not just rely on cheap scares but really dig deep into what scares people on a fundamental level. Whether it's the fear of death, loss, or the breakdown of reality. And the storytelling style could be unique, using vivid descriptions to bring the horror to life. The settings described in the stories could be so detailed that it feels like you're actually there, experiencing the horror yourself.
Perhaps the way it builds suspense. In 'Mr Nightmare 3 Horror Stories', the authors might be really good at slowly increasing the tension in each story. They start with small, strange events and then build up to a terrifying climax. This keeps the readers on the edge of their seats. Also, the character development in these stories could be a standout feature. Even in horror, well - developed characters can make the story more engaging and the horror more impactful.