How to Portal 1 Multiplayer

Do you want to Co-op like Portal 2 in Portal 1? Here’s how! About port forwarding - Portal 1 Multiplayer Map - Portal 1 Multiplayer Mod - Sadly, Portal 1 multiplayer mod has currently unsupported. If you have no idea how to configure router and port forwarding, you can use a virtual network program such as hamachi. (In this case, enter the host IP displayed in hamachi.)