Hidden Door’s cover photo
Hidden Door

Hidden Door

Software Development

Brooklyn, NY 3,223 followers

Where roleplay meets fanfiction. Step into your favorite stories, or build a brand-new world to share.

About us

Hidden Door is a game technology studio building the first narrative AI — a platform that transforms any work of fiction into an infinite social roleplaying experience, bringing together players, authors and other creators. We're hiring! https://www.hiddendoor.co/jobs Join the community: https://discord.gg/hiddendoor

Website
https://www.hiddendoor.co
Industry
Software Development
Company size
11-50 employees
Headquarters
Brooklyn, NY
Type
Privately Held
Founded
2020
Specialties
user-generated content, role-play gaming, natural language processing, social gaming, mobile gaming, game development tools, cloud, consumer product, distributed systems, MMO, and AI

Locations

Employees at Hidden Door

Updates

  • If you don't mind getting your hands dirty, the Film Noir modifier card is here to add gritty, enigmatic energy to your weekend. Play 2 stories in any community-authored world, and you'll unlock sleazy streets, flickering bulbs, and shadowy characters with shadier morals. Go ahead. Make our day.

    • A retro purple film-noir poster with cartoon detective icons and filmstrip imagery. The text reads: "Want to unlock grit, grime, sleaze, & hardboiled detectives? Play 2 stories in any community-authored world. Hidden Door." The Film Noir modifier card is labeled "Long shadows and longer trenchcoats." It directs people to hiddendoor.co
  • Whoa dude!!! To celebrate our bodacious, choice, absolutely bitchin' Atlas worldbuilder, we are stoked to announce a new IT'S THE 80s modifier card! Add this card to your deck, then add synthesizer riffs and shoulder pads to your next story. Play any community-created world to unlock the modifier card and begin your totally righteous adventures! Cowabunga!

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  • "I don't care about the world a machine has come up with. I care about the world a person has written," Hilary Mason told Rob May and Ryan Eppley on the AI In NYC Show. "That's meaningful to me." AI can create an infinite number of fictional universes, but are they meaningful? Not without humans. In this interview, Hilary shares the philosophy behind Atlas, her optimistic outlook for the near- and far-future of tech...and her favorite "only in New York" store. HINT: It has a SMELL!

    View organization page for AI In NYC Show

    33 followers

    AI has spent years helping people generate content. The next frontier? Building entirely new forms of interactive entertainment. On this week's AI in NYC, Rob May and Ryan Eppley sit down with Hilary Mason, Co-founder & CEO of Hidden Door, to explore how AI is reshaping storytelling, gaming, and creative experiences. They discuss why narrative-driven AI products are gaining traction, what it takes to build AI experiences people actually want to use, and how human creativity remains at the center of the most compelling AI applications. Key insight: The biggest opportunity for AI may not be replacing creativity—it may be expanding it. The most successful products will likely be the ones that use AI to make people more imaginative, collaborative, and engaged rather than removing them from the creative process. They also dive into the evolution of New York's AI ecosystem, lessons from building AI companies through multiple technology waves, and what the future of AI-powered entertainment could look like. What's your take — will AI become a powerful creative partner, or will human-led storytelling always have the edge? Drop your thoughts below. Full episode out now → https://lnkd.in/eEg6Qj3M Subscribe to the newsletter: https://lnkd.in/eZdnQNKA Explore more AI in NYC episodes: https://aiinnycshow.com/

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  • We've got the update report for Tuesday, May 26, 2026. Here's what we've been adding and improving over the last week. Spoiler alert, WE'VE BEEN REALLY BUSY LAUNCHING A NEW WORLDBUILDING STUDIO! FEATURES: *WE LAUNCHED ATLAS! You can now create your own playable worlds in our studio, and share them with your friends, fans and followers!!!!!!!!!!!!!!!!!!!!!!!!!!!! *Required fields in the Atlas editor now glow amber when empty, so it’s easier to spot what still needs filling in before publishing *Created a dedicated tab for Writing Style fields; made story hook requirements for archetypes and narrative roles fully functional *Subscribed players now get a triple-hearts badge on their avatar <3 <3 <3 *Launched a Creator Program landing page! Submit your application now at hiddendoor.co/create/apply *Improved pricing page FAQ with clear answers about how worlds work, turn gating, Atlas privacy, and creator program access *Updated our Terms of Service and Privacy Policy, plus added Subscriber Terms and Creator Terms; all are now live and properly linked from the site footer! *Updated homepage to showcase Atlas worldbuilding alongside the play experience *Added a clear notice for non-US visitors to the pricing page. We’re working on enabling subscriptions for you! FIXES: *Cartoon characters will now only have googly eyes when tonally appropriate! (BOOO!) *Atlas editor sessions recover gracefully from stale login tokens, rather than redirecting you away from your work! *Added a publish-time validation that catches worlds where origin hooks require archetypes no player can ever acquire, preventing worlds from getting permanently stuck! *Adjusted canon character appearance fields and entity connection generation in Atlas, fixing issues that were cutting off NPC relationships! *Fixed broken investor logos on the /about page! *Fixed a bug in which canon characters attached to story hooks were not actually appearing in the resulting story! *Fixed a frustrating bug where players in some worlds saw no story options between stories due to a crash in the episode pitch system!

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  • Today's creator spotlight is Cedar Ridge, a high school cheerleading satire by Ella Fritts! Ella started crafting Cedar Ridge High School in a TV pilot she wrote, which she described as her take on "a Beavis and Butt-Head for Women." If you miss high school — or, more likely, if you miss playing Dream Life and PRETENDING you enjoyed high school — this is for you.

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  • We’re dedicating our first Atlas creator spotlight to Dungeons & Decanters! Comedian Matt Storrs synthesized the unpredictability of a live actual play show into this interactive world. Feel like you’re playing with the cast while you explore a wine-themed fantasy setting, forge alliances, defeat enemies and laugh a lot.

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  • Here's the update report for May 19, 2026! Wow, it sure looks like we have a bunch of super secret stuff that's going to become un-secret imminently. You should follow Hidden Door's socials real closely and maybe visit hiddendoor.co and make an account and get all our emails. Y'know. To prepare!

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Funding

Hidden Door 2 total rounds

Last Round

Seed

US$ 7.0M

See more info on crunchbase