Crusader Kings III (CK3) offers a deep, character-driven grand strategy experience that shines in multiplayer. However, unlike its predecessor CK2, setting up a "true" LAN (Local Area Network) game in CK3 is more complex because the game primarily routes traffic through the Nakama multiplayer services.
While there is no dedicated "LAN-only" toggle that bypasses external servers entirely, you can still play with people in the same building by using the standard multiplayer tools or specific workarounds to ensure stability. How to Host and Join Locally
Even on the same network, the standard method for CK3 is to use the server-based system.
Host a Session: The host launches the game, selects Multiplayer, and clicks Host Game.
Share the Server ID: Once the lobby is live, the host will see a Server ID (a long alphanumeric code). Share this code with everyone in the room.
Join the Session: Other players select Multiplayer, click Join via Server ID, and enter the code.
Direct Connection: If players are on the same local network, they may sometimes see the host's game appear in the "Local" or "Scan" list, though this often still requires an active internet connection to authenticate with Paradox accounts. Crucial Setup for Stability
Multiplayer in CK3 is notorious for "Desync" (out-of-sync) errors where players see different versions of the same game. To minimize this during a LAN party, follow these community-recommended steps:
Match Checksums: Everyone must have the exact same version of the game. Even a small mod or a different DLC configuration can change your "Checksum" (the 4-letter code on the main menu), preventing you from joining.
Disable Steam Cloud: Turn off Steam Cloud synchronization for CK3 in the Steam library properties. This prevents the game from trying to sync large save files mid-session, which can cause lag. ck3 lan multiplayer
Launch Option "-noc": Some players add -noc to their Steam launch options. This can help bypass certain backend connection checks that interfere with local stability.
Clear the OOS Folder: Regularly delete the "oos" folder located in Documents/Paradox Interactive/Crusader Kings III/oos. Old error logs here can sometimes cause "cascading" desyncs in new games. Virtual LAN (VPN) Options
If you are trying to play with friends remotely but want to simulate a LAN environment to potentially improve stability, software like LogMeIn Hamachi or ZeroTier can be used.
Simulated Local Network: These programs create a virtual private network where your computers act as if they are plugged into the same router.
Fixing Connection Issues: If players cannot find each other's games, disabling IPv6 in your Windows network adapter settings is a known fix for many Paradox multiplayer titles. Gameplay Rules for Groups YouTube·Project Phoenix Mediahttps://www.youtube.com
The Great Baltic Crusade
It was a chilly winter evening when four friends gathered around a large table, their laptops and gaming setup at the ready. They were about to embark on a new LAN multiplayer campaign of Crusader Kings 3, each controlling a different character in the medieval world.
The players were:
The game started in the year 1066, and the players had chosen to play in a custom-made scenario focused on the Baltic region. Their goal was to expand their territories, convert to the desired faith, and dominate the region through diplomacy, warfare, or strategic marriages. Crusader Kings III (CK3) offers a deep, character-driven
As the game began, the players quickly realized that their starting positions were precarious. Henry, the Duke of Saxony, was sandwiched between the powerful Holy Roman Empire and the ambitious Kingdom of Poland. Erik, the King of Denmark, had to contend with the Norwegian king to his west and the Wends to his south. Casimir, the Duke of Masovia, was nestled between the Kingdom of Poland and the Grand Duchy of Kiev, while Vytautas, the Grand Duke of Lithuania, faced threats from both the Teutonic Knights and the Kingdom of Poland.
The early game saw a flurry of diplomacy and strategic marriages. Erik, the King of Denmark, quickly formed an alliance with Vytautas, the Grand Duke of Lithuania, to counterbalance the growing power of the Kingdom of Poland. Meanwhile, Henry, the Duke of Saxony, sought to secure his borders by marrying his daughter to a powerful noble within the Holy Roman Empire.
As the years passed, the players began to expand their territories through a mix of warfare and diplomacy. Casimir, the Duke of Masovia, made significant gains by conquering several neighboring duchies, while Vytautas, the Grand Duke of Lithuania, successfully defended his lands against the Teutonic Knights.
However, tensions began to rise as the players' interests clashed. Erik, the King of Denmark, and Henry, the Duke of Saxony, found themselves on opposite sides of a conflict over control of the Baltic Sea trade. The situation escalated into a full-blown war, with Erik forming an alliance with Vytautas to take on Henry and his Saxon allies.
The war raged on for several years, with battles won and lost on both sides. In the end, Erik and Vytautas emerged victorious, and Henry was forced to cede significant territory to the Danish and Lithuanian crowns.
As the game entered its final decades, the players had transformed the Baltic region. New kingdoms had risen, old alliances had been forged and broken, and the map was redrawn multiple times. In the end, it was Erik, the King of Denmark, who emerged as the dominant force, controlling a vast territory stretching from the North Sea to the Baltic Sea.
As the players packed up their gaming setup, they couldn't help but feel a sense of accomplishment and camaraderie. The Great Baltic Crusade had been a thrilling adventure, filled with twists and turns that no one could have predicted. They all agreed that they couldn't wait to embark on their next CK3 LAN multiplayer campaign.
"Rematch!" they all shouted in unison, already planning their next medieval conquests.
Crusader Kings III (CK3) does not include a native LAN-only multiplayer mode. Multiplayer is primarily provided via Paradox Interactive’s online multiplayer supported through Paradox’s matchmaking and dedicated server infrastructure or by connecting directly to friends via internet-hosted sessions. Players seeking LAN-style local network play generally rely on third-party workarounds (VPN/virtual LAN or port-forwarding) to simulate LAN connectivity. Alex, playing as Henry, the Duke of Saxony
Best for: LAN parties, no internet access, or when the Steam servers are acting up.
This is the hardest method to set up but offers the most stability. The trick is that CK3 requires a backend connection to Paradox servers for the multiplayer handshake, even on LAN. To bypass this:
The Host:
The Clients:
192.168.x.x).Note on DLC: Unlike older games, everyone on the LAN network needs to own the DLCs to see the content. If you are playing on a shared network with one account, you cannot "share" DLC activation like you could in CK2.
You have two options here:
Tip: Disable Wi-Fi on your gaming rigs. You want that hardwired stability.
Because humans can see you have a Spymaster assigned to "Find Secrets" in their court, hide your intentions.