Half-Life 2: Episode One

Half-Life ▶ Half-Life 2 ▶ Half-Life 2: Episode One ▶ Half-Life 2: Episode Two ▶ Half-Life: Alyx

Summary | For developers |Community Hub

Half-Life 2 Episode One - Background.jpg

Half-Life 2 has sold over 4 million copies worldwide, and earned over 35 Game of the Year Awards. 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. Also features two multiplayer games. Half-Life 2 not required.

Initial release date: 1 June 2006

Engine:

Source

Engine Branch:

Source 2013 Singleplayer

Developer: Valve

Publisher: Valve

Mode: Single Player

Genres: Action, First Person Shooter

Platforms: PC, macOS, Xbox 360, PlayStation 3, Android

SteamDB

Playable

87

Half-Life 2: Episode One is currently available on Steam.
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🛒 Buy it on Steam (via Browser | Steam client*)
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Supported OS: Windows • Linux + SteamOS (See system requirements)
Chromebook ready: Playable
Steam Deck status: Playable - More info on ProtonDB
Also available from the following other storefronts or websites:
Google Play ( NVIDIA Shield only)

Notice:

Warning:(

macOS only) - This game does not work on macOS Catalina (version 10.15) or later due to the removal of support for 32-bit-only apps.
Additionally, as of June 12, 2024, Valve has dropped Mac support for all GoldSrc, Source games.

This game is included in the following packages:

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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.