Have you ever seen Hellraiser?

I’ve never seen Hellraiser; I only know the character with pins in his face. I have no idea what it’s about or what the premise is, nor do I know how many films there are. How many movies are there, and what is the story? What makes it stand out and become so famous? I’ve heard of it through other people—I know it’s very well-known, but I don’t quite understand why, especially since I’ve never seen a single film. Also, a game based on it was released recently, and from the gameplay I’ve seen, it looks like a great game.