: Go to Options > Keyboard/Mouse and set Allow Developer Console to Enabled . Host the Game : Press the tilde key ( ~ ) to open the console. Type sv_lan 1 and press Enter.
Type map [mapname] (e.g., map c1m1_hotel ) to start the level.
: One player clicks "Create Network," sets a name/password, and shares it with the others.
: Friends can join by opening their console and typing connect [Host's Radmin IP] . 4. Troubleshooting Common Issues
Since you aren't using official Valve servers, you need a virtual LAN to find your friends.