This book tries to explore why so many people actively seek out and enjoy horror as a form of entertainment. Why some find pleasure in horror is a question that many have asked before, but never fully answered. This book does not claim to deliver a general answer to that question, but rather offers an overview of the most popular theories and hypothesis, as well as a study focusing on the player affect. The explanations and solutions offered include mostly psychological, emotional or general approaches. Every approach presented has its benefits and flaws and will be discussed accordingly. How these come into play individually, as well as in connection to each other, will constitute a major part of this study. After having provided the general theoretical basis of horror and why it might be so appealing to some people, this study goes on discussing the medium game, and in a further step, tries to explore if the unique characteristics of the medium game change the overall horror experience one might have. Different aspects and properties of the medium in question are discussed in detail - how immersion affects us as consumers, what the role of interactivity is and how they both relate to one another in-game, how this understanding comes into play in a game design context and how it can create a whole different experience for the player, and lastly, how certain game design elements can be utilized to further improve the emotional response.