To play in multiplayer LAN mode without an active Steam connection, you generally need to bypass the Steam API requirements that the game uses for lobby management and networking. 📋 Prerequisites

Open the configuration file provided by the emulator (usually settings.txt or SmartSteamEmu.ini ).

Browse to your Sam3.exe executable inside the installation folder and add it to the list.

Once your game is configured to allow offline network access, follow these steps to host:

To summarise, these are your three primary paths to multiplayer mayhem:

Before launching the game, all computers must be on the same local network sub-mask.

Once the emulator is set up on all PCs, the process for starting a game is straightforward and similar regardless of which emulation method you used.

Disable or remove custom workshop modifications that alter gameplay scripts, as these cause immediate synchronization disconnects. Step 2: Set Up Your LAN Emulation Environment

Create a text file named steam_appid.txt in the same folder and write 41070 (the ID for Serious Sam 3) inside it .

: If you are not in the same physical room, programs like Radmin VPN or Hamachi can create a virtual local network. Once established, the game should see the hosted server under the "LAN" tab in the multiplayer menu. Setting Up a LAN Server

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.

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The host player must click Multiplayer from the main menu, choose Split Screen & LAN , and select Start LAN Game .

If you aren't in the same physical room or the game's built-in LAN discovery fails, use a Virtual LAN tool. Radmin VPN