Counter-Strike: Global Offensive has been rebranded and re-released as Counter-Strike 2, and instead of being given its own store page, the game is now tucked away as a CS2 beta branch.

This is how you can choose it and play CS:GO again.

1. In your Library, hover over Counter-Strike 2
   
   
   
   
2. Right-click and select Properties
   
   
   
   
   
   
3. Navigate to Betas on the left menu bar
   
   
   
   
4. Under the Beta Participation drop-down menu, from the list, pick csgo_legacy - Legacy Version of CS:GO
   
   
   
   
5. Wait for the update to finish
   
   
   
   
6. Finally, from the list of launch options, pick Play Legacy Version of CS:GO
   
   
   
   
7. Hit play!
   
   

Official matchmaking no longer works.

Community servers do work, but the server browser gets no servers from the master list to display in the "Internet" tab. To overcome this, use the other tabs, and in order to discover new servers, use server tracking websites such as Game-State[www.game-state.com].

Workshop maps still work.

CS:GO support is ending on January 1, 2024. Read the help article for more information.

The gist of it is this:

After January 1, 2024 the game will still be available, but certain functionality that relies on compatibility with the Game Coordinator (e.g., access to inventory) may degrade and/or fail.

Considering CS:GO is to be left unmaintained, any Steam components of the game may eventually become outdated enough that the game stops working entirely.