Screenshots
Watch trailer on Steam ↗Project Subtrahend
LilyDynamite · Published by LilyDynamite · Official site ↗
Content notice: Character death, mild descriptions only and no images. Some mentions of drug use, sexual activity, and death. Characters will ask before going into detail about overdose or traumatic events.
3 user reviews — 100% positive (3 reviews) · 45 achievements
Last updated 27 Sept 2026
Project Subtrahend is a choose-your-own-adventure visual novel, where you have the chance to get to know the stories, lore, and personalities of nine unique characters. Choices matter in this game, and it's up to you who lives or dies as you explore what it means to be human.
£3.39
Lowest price we've ever recorded
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Price history
Indie, Casual · 2023 · More under £5 games
Explore a world where your choices shape the lives of nine characters in Project Subtrahend. Dive into a casual, indie narrative adventure released in 2023 that lets you uncover hidden truths and personal histories.
About this game
Inspired by the trolley problem, this thought-provoking choose-your-own-adventure visual novel gives YOU control over who lives and dies. You have the chance to get to know the stories, pasts, and personalities of nine unique characters after you've all been invited to help with an innocent social experiment. Explore the deep interpersonal relationships between them, learn about the politics of their world, and explore what it means to be human.
Don't get too attached... when things start going awry, you choose how to escape and who makes it out alive!
With a lore-filled world, tons of choices, entertaining gameplay, secret endings, rewards for achievements, bonus scenes, and an hour of playtime in each route, you won’t be getting bored anytime soon as you discover everything Project Subtrahend has to offer!
make Impactful Choices
When the time comes, you choose how to escape and who survives, but it won't be easy.Befriend (or be-enemy) nine vastly different characters. [\h2]
Get to know their diverse life experiences, perspectives, and relationships.
learn About Sicknessism
A new religion has emerged in New Evenfall; you have the chance to learn about it, and maybe even join in ;)earn Extra Content
Unlock achievements to fill out each character’s scrapbook and unlock bonus post-game scenes with each character!System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS *: Windows 7
- Processor: 1GHz
- Memory: 512 MB RAM
- Graphics: OpenGL 2, OpenGL ES 2, WebGL, or DirectX 9
- Storage: 200 MB available space
Recommended
- Requires a 64-bit processor and operating system
Supported Languages
Latest news
Patch NotesOfficial
Update notes for March 17 2024
We noticed the Scrapbook wasn't quite acting right, so now you will actually have the correct amount of photos in each character's Scrapbook, proportional to the amount of achievements you've unlocked. As always, some small typo and visual glitches have been fixed as well!Read full article on Community Announcements (lilydynamite)
