Overview
Just like in Portal 1, you can create a multiplayer server like you did in Portal 1. But this guide will show the community how you can play cooperative with other players online.Half Life 2 has Cooperative just like Synergy. But it has Friendly Fire, So you have to be careful while killing bad NPCs.If you wanted to play multiplayer in GoldSource singleplayer games, this will also work just for you.Just read the instructions and you’re good to go!
Getting Started
Valve has hidden Multiplayer mechanics in single player games running Source 1. You can play Cooperative with your friends or other people online.
Enable Developer Console by going to options,
[link]Open up advanced options, and check the box that says “Enable Developer Console”. Make sure you apply the new options and click the OK button.
[link]Press the “`” key, and type this command in console.
And you should be able to find a public server that you can join in.
This method is simple and you can easily do it in console.
You need to disconnect from the background map first. To do that, type
in console.
In console, type this command.
[link]
and then type this other command.
[link]
You can set the map to any map you want. Type this final command in console.
[link]
The server should be on. For other players to join their game can automatically download the map file from the server owner’s computer.
After you’ve set the map, you must heartbeat the server, by typing this command in console.
If you have port forwarded, you’re good to go! Players should now be able to join your server with this method of Cooperative. Just remember, try not to shoot your teammates!
You can also set the server’s name! Type this command in console.
[h] Chatting [/h1]
Unlike in portal, you can do text chat, but in Half-Life 2 and it’s episodes, no, you can’t. But you can do voice chat.
Type this command in console and you’ll be able to voice chat.
Problems
No bullet holes? No Problem! This can be fixed by disabling predicted weapons via console.
Be careful of using the SMG1 Grenade! Shooting it at a zombie can crash the server.