An update to Counter-Strike: Source has been released. The update will be applied automatically when you restart Counter-Strike: Source. The major changes include:

• Added 64-bit Support. 64-bit binaries will automatically be launched on systems with a 64-bit OS.
  
• Added a borderless window option to video settings
  
• Added bicubic lightmaps (from Half-Life 2: 20th Anniversary Update)
  
• Added radial fog (from Half-Life 2: 20th Anniversary Update)
  
• Added support for Steam Networking
  
• Added UI scaling for high-resolution screens
  
• Made the default server name for listen servers include the player's name
  
• Made the game launch in native resolution by default instead of 640x480
  
• Client-side prediction fixes (these fix 'jank'/rollback in certain situations)
  • Fixed a bug where when unducking, the view could glitch out if the player doesn't have space to unduck
    
  • Fixed gifts not randomly dropping when players are killed during the winter event
    
  • Added sv_autobunnyhopping so bhop servers can have this wanted behaviour with client-side prediction
    
  • Fixed a prediction bug where if the player was moved on the client, their input-based movement for that tick was not taken into account in non-player actions
    
  • Improved prediction for walking on props and other entities
    
  • Made certain client-side entities only trigger local prediction errors
    • e.g. If the viewmodel experiences a prediction error, the player will not experience a prediction error
  • Fixed prediction of viewmodel sway
    
  • Fixed a prediction error regarding weapon idle animations
• Fixed certain breakable props not gibbing correctly
  
• Fixed an issue where certain variables like position would not be updated correctly to match the server in certain situations
  
• Fixed the player's base velocity (eg. conveyors, moving items etc.) getting subtly out of sync from client/server

An update to Counter-Strike: Source has been released. The update will be applied automatically when you restart Counter-Strike: Source. The major changes include:

• Numerous security and stability improvements

Starting today the Counter-Strike: Source Beta will be available to all PC Counter-Strike: Source players. As we continue to update CSS and address issues, we want to make sure to not destabilize the core game. By releasing updates to CSS Beta first, we will be able to solicit community feedback before those changes are applied to CSS.

If you would like to be part of the group that helps us test future updates of Counter-Strike Source, please join the Beta - simply install and launch "Counter-Strike: Source Beta" from your games list in Steam. To give feedback on the changes, report bugs, or offer suggestions, please use the <a href="http://forums.steampowered.com/forums/forumdisplay.php?f=888">CSS Beta forum</a>. Don’t worry, you can join the Beta program and still play the standard Counter-Strike: Source at anytime. The Counter-Strike: Source Beta is currently not available on Mac.

Read the <a href="http://store.steampowered.com/news/4169/">full news post</a> for more details on the new beta.

Starting today the Counter-Strike: Source Beta will be available to all PC Counter-Strike: Source players. As we continue to update CSS and address issues, we want to make sure to not destabilize the core game. By releasing updates to CSS Beta first, we will be able to solicit community feedback before those changes are applied to CSS.

If you would like to be part of the group that helps us test future updates of Counter-Strike Source, please join the Beta - simply install and launch "Counter-Strike: Source Beta" from your games list in Steam. To give feedback on the changes, report bugs, or offer suggestions, please use the CSS Beta forum. Don’t worry, you can join the Beta program and still play the standard Counter-Strike: Source at anytime. The Counter-Strike: Source Beta is currently not available on Mac.

Read the full news post for more details on the new beta.

For a limited time, we're opening enrollment in the Counter-Strike: Source Beta to allow for more Counter-Strike: Source customers to join.

To join, please visit the <a href="http://store.steampowered.com/app/260/">Counter-Strike: Source Beta store page</a> and click the 'install game' button.

This beta will run for a limited time, and once complete, the update will be deployed to all Counter-Strike: Source owners for free via Steam.

For a limited time, we're opening enrollment in the Counter-Strike: Source Beta to allow for more Counter-Strike: Source customers to join.

To join, please visit the Counter-Strike: Source Beta store page and click the 'install game' button.

This beta will run for a limited time, and once complete, the update will be deployed to all Counter-Strike: Source owners for free via Steam.