An expansion for Half-Life. It has both a single-player mode (SinglePlayer) and a multiplayer mode (DeathMatch). There is an extra menu item for connecting quickly to our servers.
We recommend playing on licensed clients; it gives you big advantages. First of all, you join a huge gaming community and stay up to date with the news. Read about the other advantages of a licensed copy on our site.
Download:
op4_client.exe [195.5 MB] - The client can be installed either into an empty folder or on top of our Half-Life client.
op4_client.exe [195.5 MB] - The client can be installed either into an empty folder or on top of our Half-Life client.