Search online for the latest release of the open-source Goldberg Emulator.

From your extracted Goldberg Emulator folder, copy the modified steam_api64.dll (or steam_api.dll ).

Which (Windows 10, Windows 11, or Linux) are the host and client computers running?

If you are not in the same physical room, use software like Radmin VPN , ZeroTier , or Hamachi.

Click .

Select or look for the local hosting option.

Locate your Serious Sam 3 installation directory (usually found under Steamapps\common\Serious Sam 3\Bin\ ).

SmartSteamEmu is another popular, user-friendly wrapper that enables full LAN functionality for Steam-reliant titles without needing the Steam client open.

Often used for "cracked" or non-Steam versions to create a virtual room where the game’s LAN tab will show hosted sessions.

Are you running the or the Fusion engine version of the game?

Serious Sam 3 uses Steamworks API for its networking. To play over LAN without Steam, you must bypass the standard online authentication. This is achieved using a Steam network emulator.

Ensure every PC is running the exact same version of the game.

Connect all computers to the same router or switch via Ethernet cables.

To bypass the requirement of being online on , players often use third-party "LAN fixes" or alternative launchers.

To ensure a seamless connection, every computer on your local network must run identical versions of the game. Discrepancies in game versions or modification files will prevent players from joining the lobby.

Extract the emulator files into the Bin directory, replacing the original steam_api.dll or steam_api64.dll when prompted. Step 2: Configure the Emulator Settings

Open the Windows Control Panel and navigate to .