The Callisto Protocol Steam Digital Key

A brutal survival horror set on a dead moon

The Callisto Protocol drops players into the role of Jacob Lee, an inmate at Black Iron Prison on Jupiter's moon Callisto in the year 2320. When an outbreak turns fellow inmates into monstrous creatures, Jacob has to fight and scavenge his way through the wreckage to survive, uncovering what the United Jupiter Company has been hiding beneath the surface along the way.

Combat mixes close-quarters brawling with ranged weapons and a gravity tool once used by the prison's guards to control inmates. Encounters demand adaptation as creatures evolve, and scavenging for gear, weapons and abilities is essential to staying alive against a growing threat.

Developed by Striking Distance Studios under Krafton, this is a narrative-driven, third-person survival horror built around atmosphere, tension and moments of real helplessness, fitting alongside other horror games and story-rich titles in the genre.

What this listing gets you

This is the Standard edition of The Callisto Protocol as a Steam key, region Global, so it activates worldwide once redeemed. The key is redeemed on Steam, after which the game is owned on your own Steam account for Windows.

It runs on PC and supports a wide range of languages including English, French, Italian, German, Spanish, Japanese, Korean, Polish, Portuguese (Brazil), Chinese and Russian. The game carries a PEGI 18 rating, reflecting its violence and horror content.

Other ways to play

If you'd rather have a region-locked key tied to Europe specifically, there's the EU key for the same edition on the same platform. Those wanting more content can look at the Deluxe edition, also on Steam.

The Callisto Protocol sits comfortably among Keydra's wider Steam keys selection, alongside other action games and adventure games for players who enjoy tense, combat-driven survival experiences.