S.T.A.L.K.E.R.: Clear Sky

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S.T.A.L.K.E.R.: Clear Sky
S.T.A.L.K.E.R.: Clear Sky cover
GSC Game World
Deep Silver
X-Ray Engine
Release dates
Windows August 22, 2008
Metacritic 75
Monetization One-time game purchase
Microtransactions None
Modes Singleplayer, Multiplayer
Pacing Real-time
Perspectives First-person
Controls Direct control
Genres Action, Shooter
Art styles Realistic
Themes Eastern Europe, Post-apocalyptic
Series S.T.A.L.K.E.R.
S.T.A.L.K.E.R.: Clear Sky on HowLongToBeat
S.T.A.L.K.E.R.: Clear Sky on IGDB
S.T.A.L.K.E.R.: Clear Sky on MobyGames
S.T.A.L.K.E.R.: Clear Sky on Wikipedia
S.T.A.L.K.E.R.: Shadow of Chernobyl 2007
S.T.A.L.K.E.R.: Clear Sky 2008
S.T.A.L.K.E.R.: Call of Pripyat 2009
S.T.A.L.K.E.R.: Lost Alpha (Unofficial) 2014
S.T.A.L.K.E.R. 2: Heart of Chornobyl 2022


GameSpy online services have been shut down (see Network for solutions).

Key points

Strong modding community.[1]
Retail CD-keys are now redeemable on GOG.com or Steam using the reclaim page.
Use the Multi-Patch to replace GameSpy features.

General information

Developer's forum
TweakGuides guide
GOG.com Community Discussions for game series
GOG.com Support Page
Steam Community Discussions


Source DRM Notes Keys OS
Disc check (requires the CD/DVD in the drive to play)
CD key
TAGES Solidshield DRM. StarForce DRM for Russian release.[2] Install patches to remove the DRM on retail copies.
GOG.com key
Icon overlay.png
Icon overlay.png
CD key
Serial key for multiplayer shown in the game's library entry.
Green Man Gaming
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Humble Store
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CD key
Comes with 1.5.10 patch preinstalled.[3] TAGES DRM is reported to be inactive.[4] Some CD-keys can be redeemed on GOG.com

Essential improvements[edit]


The latest version of the game is Patch 1.5.10. This version allows for additional effects with DirectX 9 rendering that were previously reserved only for the DirectX 10 renderer. It also fixes many game breaking bugs, improves overall performance and fixes some problems with Tages DRM.
The Multi-Patch replaces the GameSpy master servers and optionally forces Vsync. The Steam version is already patched.

Skip intro videos[edit]

Use replacement files[citation needed]

Apply the S.T.A.L.K.E.R.: Clear Sky intro skip.


The Sky Reclamation Project (SRP) is an unofficial patch which fixes bugs that remain in the latest official patched version of the game.

Game data[edit]

In-game general settings.
In-game general settings.

Configuration file(s) location[edit]

System Location
Windows %USERPROFILE%\Documents\Stalker-STCS\
Steam <path-to-game>\_appdata_\
Steam Play (Linux) <Steam-folder>/steamapps/compatdata/20510/pfx/[Note 1]
CD key, language and GameSpy ID are stored in HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\GSC Game World\STALKER-STCS

Save game data location[edit]

System Location
Windows %USERPROFILE%\Documents\Stalker-STCS\savedgames\
Steam <path-to-game>\_appdata_\savedgames\
Steam Play (Linux) <Steam-folder>/steamapps/compatdata/20510/pfx/[Note 1]

Save game cloud syncing[edit]

System Native Notes
GOG Galaxy
Requires enabling backup of the Documents folder in OneDrive on all computers.
Steam Cloud


In-game general video settings.
In-game general video settings.
In-game advanced video settings.
In-game advanced video settings.

Graphics feature State WSGF Notes
Widescreen resolution
See the WSGF entry.
4K Ultra HD
Field of view (FOV)
67.5° Vertical - See Field of view (FOV).
Borderless fullscreen windowed
Use windowed mode and -no_dialog_header command line argument.
Anisotropic filtering (AF)
Up to 16 samples.
Anti-aliasing (AA)
Up to 4x MSAA + Transparency Anti-aliasing.
Vertical sync (Vsync)
In-game Vsync option is broken. Use the Multi-Patch to fix it.
60 FPS and 120+ FPS
No frame rate or refresh rate cap.[5]
High dynamic range display (HDR)
See the glossary page for potential alternatives.

Field of view (FOV)[edit]

Changing FoV[citation needed]
  1. Download FOV switcher.
  2. Copy it to the installation folder.
  3. BACKUP your original xrgame.dll somewhere. In the case of problems just copy it back.
  4. Run fov_switch.cmd
  5. Use the mouse wheel to scroll through all available variants.
  6. In the opened window enter the number from 1 till 52 depending on your game version and chosen FOV.
  7. To enable the external cam in singleplayer mode of Clear Sky (by F6-F8 buttons) just enter these commands in console:
  • bind cam_1 kF6
  • bind cam_2 kF7
  • bind cam_3 kF8


In-game control settings.
In-game control settings.


In-game audio settings.
In-game audio settings.

Audio feature State Notes
Separate volume controls
SFX and music only.
Surround sound
Up to 7.0 output[6]
Closed captions
Mute on focus lost
EAX support
EAX 2.0. HRTF can be used without any audio card with some modification. See Use OpenAL Soft's HRTF
Royalty free audio

Use OpenAL Soft's HRTF[edit]

Replace OpenAL32.dll file
1. Go to the main OpenAL Soft page and download openal-soft-****-bin.zip and bz2 archive includes sources
2. Unpack soft_oal.dll from bin/win32 directory in archive, rename it to OpenAL32.dll and replace the existing one located in bin folder of the game.
3. Create a folder called openal in %APPDATA% and unpack the hrtf folder from the source code archive in there. Create a new text file in %APPDATA% called alsoft.ini and add the following line:
4. Save it and then run the game.
5. Go to the Options→Sound and change the Sound driver to OpenAL Soft and restart the game.
6. Open up the developer console using ~ and scroll up using the Page Up key, if the message says.
SOUND: OpenAL: Required device: OpenAL Soft. Created device: OpenAL Soft

Then the OpenAL Soft device is used and with it, HRTF mode as well.


Language UI Audio Sub Notes
Retail only. Includes optional Hungarian voice-over translation. Download from here.
Features optional Polish voice-over translation.
Brazilian Portuguese
Fan translation based on original Russian and Ukrainian versions; available in both Cyrillic and Latin.
Fan translation, download.
Official translation patch from GSC, download. Duty, the military, mercenaries and the Monolith still speak Russian.


Multiplayer types

Type Native Players Notes
LAN play
32 Versus
Online play
32 Versus
Use the Multi-Patch to replace the GameSpy master server.

Connection types


Protocol Port(s) and/or port range(s)
TCP 3783, 6515, 6500, 6667, 13139, 27900, 28900, 29900, 29901
Universal Plug and Play (UPnP) support status is unknown.

VR support[edit]

3D modes Native Notes
Nvidia 3D Vision
See Helix Mod: S.T.A.L.K.E.R.: Clear Sky (DX9).
Officially supported game, see official vorpx game list.
Devices Native Notes
3RD Space Gaming Vest

Issues fixed[edit]

"Unable to connect to master server" error[edit]

The GameSpy master server has been shut down; use the Multi-Patch.

Crashes on DirectX 10[edit]

Using Nvidia inspector, delete xrengine from the clear sky profile and add it to the call of pripyat profile.

Other information[edit]


Technical specs Supported Notes
Direct3D 9.0c, 10, 10.1 Bound to the lighting renderer. DirectX 10.1 support was added in version 1.5.06.
Shader Model support 1.x, 2, 3, 4
Executable 32-bit 64-bit Notes


Middleware Notes
Physics Open Dynamics Engine
Audio OpenAL
Multiplayer GameSpy

System requirements[edit]

Minimum Recommended
Operating system (OS) 2000 SP4
Processor (CPU) Intel Pentium 4 2.0 GHz
AMD Athlon XP 2200+
System memory (RAM) 512 MB
Hard disk drive (HDD) 10 GB
Video card (GPU) Nvidia GeForce FX 5700
ATI Radeon 9600
128 MB of VRAM
DirectX 8.0 compatible


  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>/20510/ in addition to or instead of this directory. The app ID (20510) may differ in some cases. Treat backslashes as forward slashes. See the glossary page for details.