| Method | Steam Required? | Internet Required for first launch? | Works fully offline? | |--------|----------------|--------------------------------------|----------------------| | GOG version | No | No (install only) | Yes | | Steam Offline Mode | Yes (client) | Yes (once) | Yes | | Steam + +connect_lan | Yes | No after setup | No (Steam must validate occasionally) | | Pirated/cracked | No | No | Yes (illegal) |

: Ensure all PCs have the exact same version of the game installed.

You should see “Server started” messages. The server will now appear in all clients’ LAN browser (or be joinable via Direct IP to the server’s IP address).

Click . Click Change settings , then find Serious Sam 3 in the list. Check both the Private and Public boxes for the game. Click OK to save the settings.