Hidden Door

Hidden Door operates a platform for creating and playing AI-powered roleplaying fan fiction, enabling users to immerse themselves in interactive narrative worlds built around their favorite books, movies, and fictional universes. The platform allows users to pick a world, add modifiers to change vibes and storylines, create characters, and make real choices that shape a living story world with a full cast of characters. An AI Narrator dynamically generates stories rather than following scripts, creating unique playthroughs every time. Users can collect cards, solve mysteries, develop plot cards, modify rules, and share their creations with friends. For writers, forever DMs, and world-builders, Hidden Door enables the creation of playable worlds from existing writing or new ideas in as little as 30 minutes, with the ability to publish and earn revenue when others play. The platform also caters to professional authors and creators with fanbases, allowing fans to play in their worlds. Founded in 2020 and headquartered in Brooklyn, United States, Hidden Door has raised $7.0M in seed funding from investors including Homebrew, Northzone, Makers Fund, Betaworks, and Brooklyn Bridge Ventures.