
Screenshots

Watch trailer on Steam ↗Photochemistry
Thomas Horne · Published by Thomas Horne
Positive — 100% positive (14 reviews) · 8 achievements
Last updated 28 Sept 2026
Photochemistry is a challenging 2D puzzle game about synthesizing chemicals to sustain plant life in a post-apocalyptic setting. Design and construct elaborate mechanisms to produce complex compounds from simple particles.
£8.50
Lowest price we've ever recorded
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Price history
Indie, Simulation · 2024 · More £5 - £15 games
Photochemistry invites players to design intricate mechanisms for synthesizing compounds from basic particles, ensuring plant survival in a harsh, post-apocalyptic environment. Experience the thrill of chemical engineering in this unique simulation puzzle game.
About this game
■ INVENT YOUR OWN SOLUTIONS
No solution is predetermined. Utilize your own creativity and critical thinking to invent a mechanism that has never been made before.
■ UNCOVER YOUR PAST
Every robot has a creator. What were you really designed for? What comes next?
■ EXPAND YOUR TOOLKIT
Unlock new parts which increase the number of ways you can express your creativity and make the most challenging levels manageable.
■ FEATURES
— 20+ levels to test your problem solving skills
— Optional levels to test your limits
— 3 different acts each with their own unique environment and puzzle elements
— A built in recorder to share your solutions as a .gif
— Create your own stages with a built in level editor
System Requirements
Will my PC run this? →Minimum
- OS *: Windows 7 or later (32-bit or 64-bit x86)
- Processor: 4.20 GHz Quad Core Processor
- Memory: 500 MB RAM
- Graphics: Integrated graphics
- Storage: 2 GB available space
Supported Languages
Latest news
Patch NotesOfficial
Catalyst Update - Available Now
The Catalyst Update is now available for all players! I'm most likely going to forget a few changes, but here's the ones I can recall: FEATURES - A new act featuring 7 new levels - A new NPC - Simplified Chinese support - 4 new tutorial levels - An Undo button BUG FIXES - Fixed a bug that causing leaderboard entries to be uploaded to incorrect levels, leading to impossible scores This is the last major update I intend to release for Photochemistry. It's been a fun time, but I think I'm going to move on to a new project after this one (it may be a while). Bug fixes or small features may still be added. If I ever come out with a new project, I'll be sure to post it both here and on the community Discord! I hope you all enjoy the new content. Thank you for your continued support, ThomasRead full article on Community Announcements (Titaniumblade)Patch NotesOfficial
Catalyst Update Release Date (+ free copies for content creators)
Hello everyone! Hope you're having a good Halloween. I'm excited to announce the release date for the upcoming Catalyst Update. The Catalyst Update will release on November 10th, 2024 That's just 10 days away! I hope you'll enjoy the new content as much as I enjoyed making it. How will you access the new content? A new door will be open after the end of act 2. Just follow the blue light. Free Giveaways and Early Access for Content Creators Know a Youtuber, Twitch streamer, or other content creator who want to see play Photochemistry? I'm giving away free copies along with early access to the Catalyst Update to any content creator who uploads regularly, no matter how small the audience! If you or someone you know is a content creator, get in touch at contact@thomashorne.ca.Read full article on Community Announcements (Titaniumblade)AnnouncementsOfficial
COMING SOON*: Free Catalyst Expansion + Chinese Translation
Hello everyone! Hope you're having a good summer. I've been working hard during my free time over the past few months on a new content update for Photochemistry to flesh out the systems and lore of the game. I'm happy to now announce what I've been up to. The Catalyst update (v1.4.0) will contain: - 7 new puzzles (plus a few mini-puzzles) - A new character - 2 new types of particles - A new area - Lots of new lore - An undo button Here's a sneak peak of one of the new particles: {STEAM_CLAN_IMAGE}/44992246/3451dacd8fe46227c945d248c77e0ae51f9b1626.gif I also want to introduce you to the new character: Her name is Synapse and she's been around in this facility for even longer than you have. She might be able to answer some questions you have about your history and purpose. {STEAM_CLAN_IMAGE}/44992246/6d20b3ab6e53a6fb85fc2161067e16d8b800f690.gif Both Synapse and the new puzzles will be accessible just after finishing Act 2. I look forward to seeing your thoughts and puzzle solutions! Additionally, the game's getting a Simplified Chinese translation. It will be available for all base game tutorials and menus as well as the new dialogue with Synapse. I'm not quite ready to give an exact release date for the update as I'm starting classes again soon on top of my regular job, but I'm committed to a release within the next few months. If you want to be notified when the update is out, or have any other comments or feedback, feel free let me know on the community DiscordRead full article on Community Announcements (Titaniumblade)






