An update has been released for Half-Life 2: Episode One - UI and Input support for Steam Deck verification.

Half-Life: Alyx is coming in March, and we are celebrating early by making all games in the Half-Life Series FREE to play for Steam users, from now until the day it launches!

If you already have Steam installed, you can click the following links to start playing now!
Half-Life
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two

If you don't have Steam, you can download it here.

Half-Life: Alyx is set before the events of Half-Life 2 and the episodes, but the games share characters and story elements. The Half-Life: Alyx team believes that the best way to enjoy the new game is to play through the old ones, especially Half-Life 2 and the episodes, so we want to make that as easy as possible.

Updates to Half-Life 2, Half-Life 2: Episode One, Half-Life 2: Episode Two, Half-Life 2: Lost Coast, and Half-Life: Source have been released. The changes include:

• Fixed a hitch when saving games
  
• Fixed SteamVR running when entering the settings menu
  
• Fixed missing sounds on combine soldiers
  
• Fixed NPCs not blinking
  

We have updated the public release of Half-Life 2: Episode One. This update contains all the changes from the recent beta, thanks to the whole community for their help with testing and suggesting new features. Changes in this update are:

• Converted Half-Life 2: Episode One to the new SteamPipe content system, for optimized delivery of the game
• Added support for Linux operating systems
• Added support for Virtual Reality devices, in particular Oculus Rift
• Numerous bug fixes contributed by community members

We have updated the public release of Half-Life 2: Episode One. This update contains all the changes from the recent beta, thanks to the whole community for their help with testing and suggesting new features. Changes in this update are:

• Converted Half-Life 2: Episode One to the new SteamPipe content system, for optimized delivery of the game
• Added support for Linux operating systems
• Added support for Virtual Reality devices, in particular Oculus Rift
• Numerous bug fixes contributed by community members

Big Picture Support
- Added controller menu navigation
- Dual stick controllers are now the default controller layout
- Fixed controller disabling the crosshair
- Fixed some weapons not being selectable with controller for some players
- Fixed file loading crash that affected some players