So, really stupid question

[Gahlik]

But...how do you actually play through the HL games cooperatively?

[TheOrangeCube]

I hope that I am not wrong, but I think you make a server, dedicated or not and choose the map like oc_lobby, from there go left right when you spawn and near the pool you should see the campaigns... I hope this helps.

[Momizi Inubashiri]

thats right.

its the olny way i can think of it

[Datastream]

You can also make a listen server.