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
S.T.A.L.K.E.R.: Clear Sky at 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 2010
S.T.A.L.K.E.R.: Lost Alpha (Unofficial) 2014

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

Official website
Developer's forum
The S.T.A.L.K.E.R. Wiki
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)
TAGES  and Solidshield DRM. StarForce DRM for Russian release[2] It has been disabled via patches.
GOG.com key
Icon overlay.png
Icon overlay.png
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.

Large Address Aware[edit]

Improves stability on systems with at least 3GB RAM by allowing the application to use more than 2GB RAM.


The Sky Reclamation Project (SRP) is an unofficial patch which fixes bugs that remain in the latest official patched version of the game.
Clear Sky Complete focuses on improving graphics, sound and gameplay. A limited range of bug fixes is also included.

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_\
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\

Save game cloud syncing[edit]

System Native Notes
GOG Galaxy
Steam Cloud

Video settings[edit]

In-game general video settings.
In-game general video settings.
In-game advanced video settings.
In-game advanced video settings.
Graphics option Option WSGF Notes
Widescreen resolution
See the WSGF entry.
4K Ultra HD
Field of view (FOV)
90° (65° Vertical) - See Field of view (FOV).
Borderless fullscreen windowed
Use Borderless Gaming or similar software.
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
120+ FPS
No frame rate or refresh rate cap.[5]

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

Input settings[edit]

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

Audio settings[edit]

In-game audio settings.
In-game audio settings.
Audio options Native 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


Language UI Audio CC Notes
Features optional Polish voice-over translation.
A Turkish fan patch is available here. (Mirror)
An official Ukrainian patch is available here, can be installed over English version from GOG.com, or any Russian version of the game.


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 (outbound) 3783, 6515, 6500, 6667, 13139, 27900, 28900, 29900, 29901

Issues fixed[edit]

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

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

Other information[edit]


Technical specs Supported Notes
Direct3D 8, 9, 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
64-bit executable


Middleware Notes
Physics Open Dynamics Engine
Audio OpenAL
Multiplayer GameSpy

System requirements[edit]

Minimum Recommended
Operating system (OS) 2000 SP4, XP SP2 XP, Vista SP1
Processor (CPU) AMD Athlon XP 2200+
Intel Pentium IV 2.0 GHz
AMD Athlon 64 X2 4200+
Intel Core 2 Duo E6400
System memory (RAM) 512 MB 2 GB
Hard disk drive (HDD) 10 GB
Video card (GPU) ATI Radeon 9600
Nvidia GeForce 5700
128 MB of VRAM
DirectX 8.0 compatible
ATI Radeon HD 2900 XT
Nvidia GeForce 8800 GT
512 MB of VRAM
DirectX 10.1 compatible


  1. S.T.A.L.K.E.R.: Clear Sky Game - Mod DB
  2. FILEnetworks Blog: S.T.A.L.K.E.R : Clear Sky (English) - Cracked or not?
  3. Planning to buy Clear Sky - Steam Users' Forums (retrieved)
  4. GamersGate version has no DRM - why Steam? - Steam community discussions
  5. New 120Hz Games Report
  6. PC Gaming Surround Sound Round-up