This article relates to the game "Half-Life 2". Click here for more information.
This article's documentation is for anything that uses the Source engine. Click here for more information.

Half-Life 2: Episode One

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Half-Life 2: Episode One
Software Cover - Half-Life 2 Episode One.jpg
Developer(s)
Publisher(s)
Electronic Arts (retail)
Valve Corporation (Steam)
Release date(s)
June 1, 2006
Mode(s)
Steam AppID
Written in
Mod support
Yes (custom folder, Steam Workshop)
System requirements
  • Win Vista, 7 or later
  • 1.7 GHz and/or Dual-core
  • 1 GB RAM
  • 6.5 GB disk space
  • DirectX 9.0 compatible (with DX 8.1 level card)
New Engine only. For details, see below
Distribution
Retail, Steam
Previous game

Half-Life 2: Episode One is the first in a series of games that reveal the aftermath of Half-Life 2 and launch a journey beyond City 17. It focuses on developing Alyx as a character.

Consciousness returns. Gordon and Alyx discover they've somehow escaped both the reactor explosion and the G-Man's malevolent grasp. Before they can ponder their miraculous survival, the crippled Citadel lurches back to life just long enough to initiate a self-destruct sequence. With Alyx at his side, Gordon must flee a city in chaos before the Citadel's final detonation turns City 17 into a toxic, mutant-infested crater.

Aside from the story, the game initially runs on Source 2006, which introduced new features such as HDR, Phong shading, and much more. The game was later upgraded to Source 2009, then again with Source 2013 Singleplayer.

With the release of Half-Life 2 20th Anniversary Update in November 16, 2024, both Episode One and Episode Two are now accessible through Half-Life 2 main menu. As a result, both episodes are unlisted from the Steam Store.

Content

Chapters

Half-Life 2: Episode One Half-Life 2: Episode One Chapters
Chapter 1: Undue Alarm
Undue Alarm
ep1_citadel_00 		Chapter 2: Direct Intervention
Direct Intervention
ep1_citadel_03 		Chapter 3: Lowlife
Lowlife
ep1_c17_00 		Chapter 4: Urban Flight
Urban Flight
ep1_c17_01
Chapter 5: Exit 17
Exit 17
ep1_c17_05


Gallery

  • SourcePic 01.jpg

System Requirements

Windows (Old Engine/original requirement):

Windows (New Engine):

  • OS: Windows Vista, 7 or later
  • CPU: 1.7 GHz and/or Dual-core
  • RAM: 1 GB
  • Disk space: 6.5 GB (15GB+ recommended)
  • GPU: NVIDIA GeForce 6 series, ATI Radeon X1600, Intel HD Graphics 3000 (with 128MB VRAM)
  • Direct3D 9.0 compatible video card (with atleast DirectX 8.0 or higher feature level)
    Some features such as HDR and color correction requires DirectX 9.0 or higher graphics card.
Note.pngNote:A powerful DX9 or later card is highly recommended because the new engine (Source 2009, Source 2013) are more demanding to run, compared to old engine/previous versions.
Note.pngNote:The latest version is no longer compatible with XP since the 2022 Steam Deck update.
User using these OS can downgrade to previous version of the game by using the previous beta branch (dated from Sep 2019). But please note that this older branch does not include all the bug fixes that were introduced with Steam Deck update.
Note.pngNote:Due to Steam dropped support on Windows XP/Vista, users need run the game without Steam by running the hl2.exe executable with -game episodic.

OS X:

  • OS: OS X 10.5.8, 10.6.3 (up to 10.14.6)
  • CPU: 2.0 GHz and/or Dual-core
  • RAM: 1 GB
  • Storage: 6.5 GB (15GB+ recommended)
  • GPU: NVIDIA GeForce 8xxx series, ATI Radeon X1600, Intel HD Graphics 3000
    OpenGL 2.1 compatible
  • Audio: OpenAL compatible
Note.pngNote:Mac version are no longer supported after macOS Catalina (10.15), due to this game only have 32-bit binaries.
User can manually build Intel 64-bit/Apple Silicon version of HL2 by following this guide.

Linux:

  • OS: Ubuntu 12.04, SteamOS 1.0 or later
    Other Linux distros supported.
  • CPU: 2.0 GHz and/or Dual-core
  • RAM: 1 GB
  • Storage: 6.5 GB (15GB+ recommended)
  • GPU: NVIDIA GeForce 8xxx series, ATI Radeon X1600, Intel HD Graphics 3000
    OpenGL 2.1 compatible
  • Audio: OpenAL compatible
Note.pngNote:The system requirements for Half-Life 2: Episode One Half-Life 2: Episode One on Linux are unofficial, based off Windows/Mac info, as well as other Source games that support Linux, such as Portal 2.

Limitations/Bugs

  • For the list of Half-Life 2: Episode One bugs, see this GitHub page.

External links

Retrieved from "https://developer.valvesoftware.com/w/index.php?title=Half-Life_2:_Episode_One&oldid=458276"