GOG add the huge S.T.A.L.K.E.R. G.A.M.M.A. as a one-click mod install

S.T.A.L.K.E.R. G.A.M.M.A. is a big mod for the already big standalone experience of S.T.A.L.K.E.R. Anomaly and now easier to install thanks to GOG.

It's all getting a bit complicated in the Stalker world now so if you're a wee bit confused (I was) here's the basics: Anomaly is a standalone game based on the original series. It blurs the line between mod and fan game. Gamma (Gigantic Automated Modular Modpack for Anomaly) expands it even further but it can be tricky to install it all together where it works nicely. It's all free and now you can get it together in one neat package.

From the Gamma website:

A Zone That Evolves With You

GAMMA adapts S.T.A.L.K.E.R. Anomaly into a longer-form, higher-stakes experience. It encourages cautious exploration, smart inventory management, and tactical engagements across a world that's as deadly as it is dynamic.

With multiple difficulty presets, faction options, and curated progression paths, every run feels different yet always true to the heart of the Zone.

Thanks to its modular nature, every aspect that you want to change in G.A.M.M.A. can be easily tweaked in-game through the Mod Config Menu (MCM) or through ticking and unticking individual mods in the Mod Organizer 2 (MO2) instance it is based on. An entire discord community is ready to help you fine-tune the experience to your liking.

Community-Built. Curated with Care.

This isn't just a modpack, it's the result of thousands of hours of refinement and specific mods development from passionate fans. Designed to be stable, lore-respectful, and challenging, GAMMA is regularly updated and supported via dedicated Discord channels and install tools.

Anomaly was just the beginning. GAMMA is the test of your true stalker instincts.

Now you can just grab it direct from GOG.

Also check out the GamingOnLinux guide for GOG games on Linux / SteamOS.