Subsurface Circular

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  • Subsurface Circular

A detective stationed on the Subsurface Circular investigates a series of disappearances among the city’s robotic working class. Collect words and phrases, then use them in dialogue puzzles to uncover the world's secrets and determine its future.

Inspired by classic adventure games and modern dialogue systems, Bithell Games has created a single session story which respects your time and your intelligence.

Key Features

  • A mature, polished, one-sitting game.
  • Developed by the award-winning team behind Thomas Was Alone and Volume.
  • A graphical twist on the classic text-based adventure.
  • Uses 'Focus Points', a unique vocabulary-based inventory system.
  • Original soundtrack by Dan Le Sac.

  • Comprehensive art gallery featuring the detailed work that went into this world.

  • Unlockable ‘BithellBot’, our interactive take on a developer’s commentary.


If this game is ‘short’, what’s to stop me getting a refund when I’m done?

You’re browsing Steam, which means you understand the work that goes into games, and are in principle up for paying for ones that entertain you. We hope that after a bit of time with Subsurface Circular, you’ll feel good about the price you paid.

Do I need to have played other Bithell games to enjoy this one?

No. Subsurface Circular tells its own self contained story.

Why is the game only available in English?

As you can imagine, a text adventure game contains a terrifying amount of text, but more importantly, throughout the game we use the particular quirks of word ordering and double meaning in English to support the combination and recombination of threads. Put simply, other languages are going to be more than a straight translation: They’re going to need rewrites and changed design. Not impossible, but more than we could get done this time around. If the game proves successful, we’d like to revisit this.

Today's Deal: Save 50% on Subsurface Circular & Quarantine Circular!* Look for the deals each day on the front page of Steam. Or follow us on twitter or Facebook for instant notifications wherever you are! *Offer ends Monday at 10AM Pacific Time


Hi all, Did you like Subsurface Circular? Well good news, we just launched a follow up, Quarantine Circular. It’s not a sequel, think of it more as another installment in an anthology. Thanks so much for the support. If you’re seeing this, then that probably means you bought Subsurface Circular, and are therefore d...


Hi everyone, Thanks so much for your support of the game! I've been talking publicly about some of our numbers (here, for example) and they're all.. you know.. good :) It felt like the right time to post a thank you here. The Steam community have been fantastic, and judging from reviews, it looks like the game has entertained everyone nicely. We're going to keep experimenting with this short format, and I can't wait to tell you about some of the ideas we're playing with. If you'd like to support...


Hi all, thanks for playing our game and your continued support. Our second update. While we fixed a bunch of train stopping issues with the first update, a couple of you were still having issues.. after some hunting, we think we found the cause: A cumulative error that broke the game after a high number of frames.. about 4 hours for us mere mortals, but at higher framerates, maybe as little as an hour of play. If you paused to do something else and came back, or you had a powerful rig, then that...


Hi all. Wow.. just over 24 hours from launch, and I'm so pleased with how this is going. Seems our weird experiment in shorter games is panning out. We just put out an update, here's what it does: No more starting at 768p - Some folks were getting the game loading for the first time at weird, small resolutions. While Unity does seem to have a built in issue here, we've improved the situation by defaulting to 1080p if Unity doesn't detect your resolution. That should make it a bit less of a pain ...




  • OS: Windows 7
  • Processor: 2.5 GHz
  • Memory: 8 GB RAM
  • Graphics: Dedicated 2048 MB+
  • Storage: 1 GB available space



  • OS: MacOS Sierra+
  • Processor: 2.5 GHz
  • Memory: 8 GB RAM
  • Graphics: Dedicated 2048 MB+
  • Storage: 1 GB available space
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