How To Play Serious Sam 3 Multiplayer Lan Without Steam
When Serious Sam 3 launched, Croteam used Steamworks for its multiplayer backend. Normally, even "LAN" games send a handshake to Steam's servers. If Steam is offline, or you aren’t logged in, the multiplayer button grays out. The goal is to decouple the game from Steam's DRM and redirect its network discovery to pure IPX/ UDP broadcast.
Follow these steps to set up a local multiplayer session of Serious Sam 3: BFE on a LAN without using Steam. This guide assumes each PC already has the game installed and running (retail, DRM-free, or installed from a non‑Steam copy).
If you want, tell me whether you have a Steam or non‑Steam copy and your OS (Windows/Linux) and I’ll give exact commands and port numbers for your setup.
steam_api.dll and rename it to steam_api.dll.bak or move it to a backup folder. Do not delete it; you need it if you want to play on Steam again.steam_api.dll and steam_interfaces.txt into the Bin folder (or the root folder if the fix specifically instructs so).If you want to play online legitimately later:
Playing Serious Sam 3: BFE over a Local Area Network (LAN) without relying on Steam's online matchmaking typically requires a "LAN Fix" or using Virtual LAN (VLAN) software to bridge your connection. While the game natively supports 16-player LAN play, the Steam version often requires an active Steam connection to validate sessions unless specific workarounds are used. Methods to Play Serious Sam 3 via LAN (Non-Steam) 1. Using a LAN Fix or Emulator
If you have a DRM-free or non-Steam version of the game, you may need a dedicated "LAN fix" to enable the game's internal server browser to see other local players.
Installation: Usually involves extracting specific network fix files into the game's main folder (e.g., Bin/x64/ or Bin/).
Launching: Use the modified executable provided by the fix rather than the standard Steam launcher. 2. Virtual LAN (VLAN) Software
If players are not in the same physical room but want to simulate a LAN environment without Steam's servers, VLAN software is the most reliable method.
Radmin VPN: Widely recommended for its ease of use; players join a private network and then look for servers in the game’s Search LAN tab.
Hamachi: A classic alternative, though users must manually connect to the host’s Hamachi IP address if the server does not appear automatically. 3. Dedicated Server Setup (Advanced)
For a more stable experience, you can run a standalone dedicated server. how to play serious sam 3 multiplayer lan without steam
To play Serious Sam 3: BFE via LAN without the Steam client, you generally have two main approaches: using the game's built-in split-screen feature for offline local play on one PC, or setting up a Direct IP connection for multiple PCs on a local network. 1. Offline Split-Screen (One PC)
Serious Sam 3 is one of the few modern PC titles that natively supports up to 4-player local split-screen. This is the most straightforward "no-Steam" multiplayer method because it can be played completely offline.
Requirements: Multiple input devices (e.g., one keyboard/mouse and one or more Xbox controllers).
Setup: From the main menu, go to Multiplayer > Split Screen. You can choose between Versus or Cooperative modes and configure the screen orientation (horizontal or vertical). 2. Direct IP Connection (Multiple PCs)
If you want to play on separate computers without Steam, you can bypass the standard matchmaking lobby by connecting directly via your local IP address.
Step 1: Find the Host's IP: On the host computer, open the Command Prompt (cmd), type ipconfig, and look for the IPv4 Address (e.g., 192.168.1.5).
Step 2: Start a Dedicated Server: Use the standalone dedicated server tool located in the game's installation folder (typically in /Help/ or /Bin/).
Step 3: Connect via Console: On the client PCs, open the in-game console (usually the ~ key) and enter the command:+connect [Host IP Address]:27015(Example: +connect 192.168.1.5:27015). 3. Virtual LAN (VPN)
If your PCs are not physically connected to the same router, you can use software like Radmin VPN or Hamachi to create a "virtual" local network. Serious Sam 3: BFE - Dedicated Servers - Steam Community
Playing Serious Sam 3: BFE over LAN without Steam can be tricky because the game’s network menu is often tied to Steamworks authentication. Even for local play, the standard Steam version may require being online just to access the multiplayer menus.
To bypass these restrictions and play on a local network, you generally have three main options: using Virtual LAN (VPN) tools for a "simulated" LAN, manual console commands for direct IP connection, or local split-screen if you're in the same room. Option 1: Virtual LAN Tools (Recommended) When Serious Sam 3 launched, Croteam used Steamworks
Third-party tools can trick the game into seeing other computers as if they are on a local network, often bypassing the need for an active Steam connection to find lobbies.
Radmin VPN: Highly recommended for modern systems. It creates a virtual private network where players can see hosted LAN lobbies even if the game's standard server browser isn't working.
Tailscale: A more secure, modern alternative that allows you to share access to your computer "node" with specific friends so they can connect directly to your local IP. Option 2: Direct IP Connection (Advanced)
If you can reach the main menu but can't find your friend's server in the browser, you can force a connection using the game's developer console.
Find the Host’s Local IP: On the host computer, open the Command Prompt and type ipconfig. Look for the "IPv4 Address" (usually something like 192.168.1.XX).
Open the Console: In the game, press F1 or ~ to open the console. Host a Server: Start a "Network Play" session as a server.
Join via Command: On the client computer, open the console and type:gam_strConnectToIP = "192.168.1.XX:27016"followed by:gamStart()(Note: The default port for SS3 is typically 27016 or 27015). Option 3: Local Split-Screen (No Network Required)
If the goal is simply to play with someone in the same room, Serious Sam 3 natively supports up to 4-player split-screen on a single PC.
Serious Sam 3: BFE multiplayer over LAN without Steam, the most reliable modern method involves Steam emulator
to bypass the platform's networking requirements while keeping the game's LAN functionality intact Core Method: Goldberg Steam Emulator Goldberg Steam Emulator
is the preferred tool for this purpose. It essentially "tricks" the game into thinking Steam is running locally, redirecting what would be online traffic into a LAN broadcast How it works : You replace the original steam_api.dll steam_api64.dll ) in your game's folder with the version provided by Goldberg. If you want, tell me whether you have
: Once the emulator is active, you can launch the game normally. When you host a session under Network Play > Cooperative > Start Server
, it should now appear on the LAN tab for other players on the same network. Alternative for Remote LAN: Virtual VPNs
If you are trying to play "LAN" over the internet with friends who aren't physically in the same room, you can use VPN tunneling software to create a virtual local network. LogMeIn Hamachi
: A classic tool that creates a virtual room for up to 5 players. Once everyone is in the same Hamachi network, the game treats them as if they are on a physical LAN. ZeroTier or Parsec
: These are modern alternatives often cited by tech efficiency reviewers for having lower latency and better stability than older VPN tools. Offline Option: Split-Screen
If you simply want to play with someone in the same room without any network hassle, Serious Sam 3: BFE natively supports 4-player split-screen on a single PC. Navigate to Split Screen from the main menu. Choose your mode (Cooperative or Versus).
Assign controllers (the game supports a mix of keyboards, mice, and gamepads). Select your layout and start.
Good news: Serious Sam 3 actually has a hidden native LAN mode. Most players miss it because Steam defaults to "Steam Friends" multiplayer. Here is how to unlock pure LAN.
If you use mods (like Serious Fusion), ensure every player has the exact same version and file structure. Any mismatch, including different .gro file sizes, will break LAN.
This method is for those who have a DRM-free copy (e.g., GOG version) or an unpacked version. Note: I do not condone piracy, but this information is provided for educational use with legally owned copies that have been modified.
SSE redirects all Steamworks P2P calls to the local subnet. This method works even if the host PC has no internet.