Hidden Door

What is Hidden Door?

Hidden Door is a platform for building and playing interactive stories in shared fictional worlds. It uses a narrative world model that tracks characters, rules, places and state, and a story engine that checks each story turn against the world's canon before players see it.

Key capabilities of Hidden Door

• Narrative world model: tracks characters, rules, places and state.
• Canon-checking story engine: validates each turn against the world's canon.
• Atlas studio: a world-building studio for characters, rules, lore and storylines.
• Creator MCP: build and extend worlds from Claude and other AI assistants.
• Experience API: delivers stories to other products.
• Content controls: ratings from All ages to Mature and adjustable death settings.

How Hidden Door works

Creators model a world in Atlas, setting what is canon, what can change and what cannot. Players then take story turns, and the engine checks each one against the world before showing it. Formats include interactive fiction, character chat, social games, microdramas, comics and audio series.

Who uses Hidden Door?

Hidden Door is for rights holders who want to turn a licensed world into interactive experiences, and for players who want to play inside those worlds. Listed worlds include Dracula, The Land of Oz, The Call of Cthulhu, Pride and Prejudice and Sherlock Holmes.

Hidden Door pricing

Hidden Door links to a pricing section on its site but does not list prices in its main page copy. Pricing is available from the vendor.

Hidden Door alternatives

AI Dungeon is a text adventure game built on free-form AI generation, without canon enforcement for licensed worlds. Charisma.ai is a platform for interactive characters and branching stories used by studios. Friends and Fables is an AI-assisted tabletop role-playing game. Hidden Door differs by enforcing the canon of a world.