This study delves into the psychological horror elements of the video game Penumbra, examining how the game utilizes atmosphere, narrative, and gameplay mechanics to create a sense of fear and dread. The primary focus of the analysis will be on the psychological impact of the game's setting, sound design, and enemy encounters on the player's experience. Furthermore, the role of isolation, both physical and psychological, will be investigated as a key component in the game's horror design. The research will provide insights into the effectiveness of Penumbra's approach to horror and its exploration of the human psyche within a survival context.