The Simplified Dungeon Master is a GPT (Generative Pretrained Transformer) developed to provide an immersive and personalized one-on-one role-playing experience. This GPT works in conjunction with ChatGPT and acts as an adaptive Dungeon Master, allowing users to design their character and play individually tailored one-shot campaigns. By implementing a dynamic narrative structure, it manifests an immersive storyline and generates responsive dialogues enabling the user to fully interact with the GPT, which shapes the game as it progresses. The title of the GPT suggests its role as a simplified interaction model of a Dungeon Master - a traditional figure in tabletop games like Dungeons and Dragons, who guides players through the game, controlling non-player characters and describing locations, actions and events. This interactive, adaptive, and immersive approach taps into the text-based virtual reality RPG (Role Playing Game) space, encouraging user creativity and improvisation. Given its requirement for ChatGPT Plus, it is understood that expanded capabilities compared to standard usage are provided, potentially implying enhanced immersion and improved response quality within users' individual campaigns.