What is Project Subtrahend Linux?

Project Subtrahend is a choose-your-own-adventure visual novel, where you’ll have the chance to get to know the stories, pasts, 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. This page focuses specifically on the Linux version of the game, including prices, regions, activation methods and compatible storefronts.

How can I find the best price for Project Subtrahend Linux?

We track live prices for Project Subtrahend Linux from official retailers and trusted third-party marketplaces. Use the country, platform and service filters below to compare offers side by side and quickly spot the cheapest key that works in your region.

How do I redeem a Project Subtrahend Linux game key?

After you buy a Project Subtrahend Linux game key, you'll receive a secure digital code (often called a CD key or activation key). Redeem it through the correct platform client — for example Steam, PlayStation, Xbox or another supported launcher — and the game will be added to your library for download. Always double-check platform and region compatibility before you purchase to avoid activation issues.