PCGame

The Callisto Protocol™

Third-person survival horror in a moon prison overrun by monsters

Striking Distance Studios · Published by KRAFTON, Inc. · Released Dec 1, 2022

ActionAdventure

Reviews
Mixed
64% of 37K
Recent reviews
Mixed
65% of 82 in 30 days
Players
34
daily peak, Nov 7, 2026
Steam Deck
Verified
Last update on Steam
2 years ago
Jul 30, 2024
Minimum PC
GTX 1060
8 GB RAM · 75 GB disk
Full requirements

What is The Callisto Protocol™?

This single-player, third-person survival horror game takes place in Black Iron Prison on Jupiter's moon Callisto, where inmates turn into monsters. As prisoner Jacob Lee, you scavenge for gear and fight through the prison with melee attacks, guns, and a gravity weapon while trying to escape.

For you if...

  • +you like sci-fi horror with a tense atmosphere
  • +you prefer close-range combat mixed with shooting
  • +you want a linear, story-led single-player game

Not for you if...

  • −you prefer ranged fighting to close-quarters combat
  • −you want open-ended exploration rather than linear progression

What players say

64% of 37,451 reviews are positive · 65% of 82 in the last 30 days

Players praise the visual detail and tense atmosphere. Common complaints include repetitive melee combat, slow pacing, and a weak story. Some players also report crashes, graphical glitches, or unreliable saves.

Players over time

▼ -19% vs a month ago

Players online on Steam, one sample a day.

Highest since Sep 2026: 60 players on Sep 27, 2026.

Show the data
DayPlayers
Nov 7, 202634
Nov 6, 202631
Nov 5, 202626
Nov 4, 202632
Nov 3, 202626
Nov 2, 202631
Nov 1, 202641
Oct 31, 202635
Oct 30, 202629
Oct 29, 202631
Oct 28, 202626
Oct 27, 202636
Oct 26, 202637
Oct 25, 202643
Oct 24, 202640
Oct 23, 202642
Oct 22, 202639
Oct 21, 202630
Oct 20, 202632
Oct 18, 202656
Oct 17, 202636
Oct 16, 202621
Oct 15, 202631
Oct 14, 202629
Oct 13, 202648
Oct 11, 202647
Oct 10, 202641
Oct 9, 202646
Oct 8, 202648
Oct 7, 202633
Oct 6, 202644
Oct 4, 202649
Oct 3, 202633
Oct 2, 202628
Oct 1, 202638
Sep 30, 202635
Sep 29, 202646
Sep 27, 202660
Sep 26, 202649
Sep 25, 202638
Sep 24, 202648
Sep 23, 202642
Sep 23, 202651
Sep 22, 202650
Sep 21, 202647

How many players finish The Callisto Protocol™?

40% of Steam players have unlocked «I Do Belong Here», the achievement for finishing the main story.

Share of everyone who owns the game on Steam, including those who barely played it. Updated weekly.

Screenshots and trailer

The Callisto Protocol™ screenshot 1

The Callisto Protocol™ system requirements

Minimum: GTX 1060, 8 GB RAM, 75 GB of disk space.

As published by the developer.

Can my PC run The Callisto Protocol™?

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Minimum

OS
Windows 10/11
Processor
Intel® Core™ i5-8400 or AMD Ryzen™ 5 2600
Graphics
NVIDIA® GeForce® GTX 1060 or AMD Radeon™ RX 580
Memory
8 GB RAM
Storage
75 GB available space
DirectX
Version 11

Recommended

OS
Windows 10/11
Processor
Intel® Core™ i7-8700 or AMD Ryzen™ 5 3600
Graphics
NVIDIA® GeForce® GTX 1070 or AMD Radeon™ RX 5700
Memory
16 GB RAM
Storage
75 GB available space
DirectX
Version 12
Notes
SSD recommended

Does The Callisto Protocol™ have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Does The Callisto Protocol™ run on Steam Deck?

Verified Yes, Verified by Valve: it works on Steam Deck out of the box.

  • All functionality is accessible with the default controller configuration
  • Shows Steam Deck controller icons
  • In-game text is legible on Steam Deck
  • Default graphics settings perform well on Steam Deck
  • Singleplayer gameplay requires active internet connection
  • External controllers are not supported for the primary player

PC version details

DRM
None declared on Steam
Controller
Full controller support
Platforms
Windows
Achievements
46
Steam features
Cloud saves, Family Sharing
Age rating
17+
Languages
Full audio: English, French, Italian, German, Spanish - Spain, Japanese, Korean, Simplified Chinese. Text only: Polish, Portuguese - Brazil, Spanish - Latin America, Russian.

Does The Callisto Protocol™ use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam

Tags

Recent updates

8 DLC available.

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