GPT Dungeon (demo) is a GPT that exemplifies the combination of AI technology and gaming. It works by employing GPT as a Dungeon Master (DM) in a text-based adventure game. The DM, in tabletop role-playing games, typically guides players through the game narrative, interprets rules, and controls the game dynamics. By transforming this role with GPT, the tool brings a new kind of interactive gaming experience. Users engage in a dynamic story creation process where the game narrative unfolds based on their textual input. This uniquely puts the users in control of their adventure storyline. Given that it's a demo, it serves as a glimpse into the potential use case of AI in interactive entertainment and storytelling. The tool requires a subscription to ChatGPT Plus, highlighting synergy with other AI tools for its operation. Enhancing traditional text-based adventure games with AI, the GPT Dungeon (demo) opens a new avenue for AI utilization in the field of interactive exploration and entertainment.