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Difference between revisions of "The Callisto Protocol"

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Revision as of 00:45, 5 December 2022

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The Callisto Protocol
The Callisto Protocol cover
Striking Distance Studios
Unreal Engine 4
Release dates
Windows December 2, 2022
Metacritic 80
OpenCritic 76
Monetization One-time game purchase, DLC
Modes Singleplayer
Pacing Real-time
Perspectives Third-person
Genres Survival
Art styles Realistic
Themes Horror
The Callisto Protocol on HowLongToBeat
The Callisto Protocol on IGDB
The Callisto Protocol on MobyGames
The Callisto Protocol on Wikipedia

The Callisto Protocol is a singleplayer third-person survival game.

The game was released on December 2, 2022. At launch the game was suffering from major performance and shader compilation stutter problems.

Developers announced free New Game + and Hardcore game modes to be added to the game on February 7, 2023.[1]

General information

Official Discord server
Steam Community Discussions


Source DRM Notes Keys OS
Epic Games Store
Epic Games Launcher
Digital Deluxe Edition also available.
Icon overlay.png
Digital Deluxe Edition also available.
All versions require Denuvo Anti-Tamper DRM.[2]

Version differences

Digital Deluxe Edition includes the base game, Season Pass and Retro Prisoner character and weapons skin
Day One Edition was for people who pre-purchased the game, including the base game and Retro Prisoner character and weapons skin.


Type Notes
DLC Season Pass with content regarding story, skins, new death animations and new mode.
One-time game purchase The game requires an upfront purchase to access.

DLC and expansion packs

Name Notes
Pre-purchase incentive Retro Prisoner character and weapons skin.
Season Pass Includes Outer Way Skin Collection (February 7, 2023), Contagion Bundle (March 2023, Contains new Contagion mode: reduced ammo and health drops, a customized difficulty and permadeath), Riot Bundle (Spring 2023, Black Iron Prison area, twelve new enemy death animations and Engineer Skin Collection) and story content (Summer 2023.)[1]

Essential improvements

Skip intro videos

Rename/move/delete logo files[citation needed]
  1. Go to <path-to-game>\TheCallistoProtocol\Content\Movies\.
  2. Rename/move/delete the following files:

Game data

Configuration file(s) location

System Location
Windows %LOCALAPPDATA%\CallistoProtocol\Saved\Config\WindowsNoEditor
Steam Play (Linux) <Steam-folder>/steamapps/compatdata/1544020/pfx/[Note 1]

Save game data location

System Location
Windows %LOCALAPPDATA%\CallistoProtocol\Saved\SaveGames
Steam Play (Linux) <Steam-folder>/steamapps/compatdata/1544020/pfx/[Note 1]

Save game cloud syncing

System Native Notes
Epic Games Launcher
Steam Cloud


Supports benchmarking option in the Graphics menu.

Graphics feature State Notes
Widescreen resolution
4K Ultra HD
Field of view (FOV)
Borderless fullscreen windowed
Anisotropic filtering (AF)
Texture filter quality option available: Low, Medium or High.[3]
Anti-aliasing (AA)
Disabled, FXAA and TAA
Using any different anti-aliasing option than TAA will disable screen space reflections, physical refractions and ray tracing.[4][3]
High-fidelity upscaling
Vertical sync (Vsync)
60 FPS and 120+ FPS
High dynamic range display (HDR)
DX12-only and requires HDR to be enabled through Windows first. Otherwise option will be greyed out.[4]
Ray tracing (RT)
Ray-traced "transmission" (on/off toggle), shadows (on/off toggle) and reflections (disabled, medium or high).[6][5] DX12-only.
Color blind mode
High contrast mode available to separately color player, enemies and pickups.[3]
The game engine may allow for manual configuration of the game via its variables. See the Unreal Engine 4 page for more details.


Keyboard and mouse State Notes
Mouse acceleration
Mouse sensitivity
Separate Aim and Look sensitivity sliders and smoothing options available available.[3]
Mouse input in menus
Mouse Y-axis inversion
Option also available to invert x-axis.[3]
Controller support
Full controller support
Controller remapping
Only choice to pick between Right hand and Left hand controller mapping.[3]
Controller sensitivity
Separate Aim and Look sensitivity sliders available.[3]
Controller Y-axis inversion
Option also available to invert x-axis.[3]
Additional information
Controller hotplugging
Haptic feedback
Simultaneous controller+KB/M


Audio feature State Notes
Separate volume controls
SFX, Music and Dialogue toggles and volume sliders available.[3]
Surround sound
Font size, Font color, Speaker name (and color), Background (opacity and color) and Dyslexic font options available.[3]
Closed captions
Mute on focus lost
Royalty free audio


Language UI Audio Sub Notes
Simplified Chinese
Brazilian Portuguese
Latin American Spanish

Issues unresolved

Performance is very limited

Due to the game's CPU utilization being very single-thread limited, the CPU is underutilized and subsequently performance is severely impaired.[7] The developers of the game have acknowledged this problem and are working on alleviating these performance issues through several upcoming patches.[8][9]

Shader compilation stutter

The game suffers from noticeable stutters during gameplay, which is caused by shader compilation that occurs during gameplay whenever the CPU compiles the shader of a new effect appearing on the screen. The game does not pre-compile its shaders.[7][10][11][4] The developers have acknowledged this problem.[8] A patch was released on December 3, 2022 to "improve gameplay stuttering issues due to shader compilation", but it has been unconfirmed so far if this patch really alleviated or even solved the problem.[9]
Workaround: create shader cache on load (DX11-only)[12]
Switching to DX11 causes some graphical options to become unavailable, see Video table.
Increases loading times.
  1. Switch the game to DirectX 11 in the grahpics menu.
  2. Insert the following lines in Engine.ini, located in config file location.

Game will not launch due to VR hook

If VR hardware is used, you may be unable to launch the game without its requisite software running.
Workaround: delete VR hook files[13]
  1. Delete <path-to-game>/Engine/Binaries/ThirdParty/OpenXR/win64/openxr_loader.dll.

Other information


Technical specs Supported Notes
Direct3D 11, 12 Can swtich DirectX version in General Graphics menu, requires restart.[5][14]
Executable 32-bit 64-bit Notes


Middleware Notes
Physics PhysX
Audio Wwise

System requirements

Minimum Recommended
Operating system (OS) 10, 11
Processor (CPU) Intel Core i5-8400
AMD Ryzen 5 2600
System memory (RAM) 8 GB
Hard disk drive (HDD) 75 GB
Video card (GPU) Nvidia GeForce GTX 1060
AMD Radeon RX 580
DirectX 11 compatible
A 64-bit operating system is required.


  1. 1.0 1.1 File/folder structure within this directory reflects the path(s) listed for Windows and/or Steam game data (use Wine regedit to access Windows registry paths). Games with Steam Cloud support may store data in ~/.steam/steam/userdata/<user-id>/1544020/ in addition to or instead of this directory. The app ID (1544020) may differ in some cases. Treat backslashes as forward slashes. See the glossary page for details.


  1. 1.0 1.1 The Callisto Protocol - 12:24 AM · Dec 2, 2022 - Twitter - last accessed on 2022-12-03
  2. The Callisto Protocol (App 1544020) · History · Change #U:34322451 · SteamDB - last accessed on 2022-11-24
  3. 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 The Callisto Protocol - PC Game Settings - YouTube - last accessed on 2022-12-02
  4. 4.0 4.1 4.2 #StutterStruggle - Steam Discussion Forum - last accessed on 2022-12-02
  5. 5.0 5.1 5.2 The Callisto Protocol - 4K Ray Tracing Benchmark - Max Settings - NVIDIA RTX4090 - YouTube - last accessed on 2022-12-02
  6. The Callisto Protocol has shader compilation stutters and optimization issues on PC - DSOGaming - last accessed on 2022-12-02
  7. 7.0 7.1 The Callisto Protocol - The DF Tech Review + PS5 vs Xbox Series X/ S + PC #StutterStruggle Analysis - YouTube - last accessed on 2022-12-02
  8. 8.0 8.1 The Callisto Protocol - Twitter - last accessed on 2022-12-03
  9. 9.0 9.1 The Callisto Protocol - 5:35 AM · Dec 3, 2022 - Twitter - last accessed on 2022-12-03
  10. Terrible Stutters - Steam Discussion Forum - last accessed on 2022-12-02
  11. Stuttering but not refund worthy (this should get fixed though) - Steam Discussion Forum - last accessed on 2022-12-02
  12. Actual fix for microfreezing using the config file - Steam Discussion Forum - last accessed on 2022-12-03
  13. Game not starting FIX - last accessed on 2022-12-03
  14. The Callisto Protocol - GTX 1650 | 1080p + FSR - Medium Settings | i3 12100F - last accessed on 2022-12-02