Ensure that Windows Defender or third-party antivirus software allows Crusader Kings 3 through the public and private firewall settings on all participating machines.
In the multiplayer menu, click or look under the "Local" tab. The hosted game should appear. Enter the password if necessary and click Join . Essential Tips for Smooth LAN Sessions in 2026
: While the host's DLCs are typically shared with all players in the session, disabling large DLCs like Tours and Tournaments may improve stability in very long-running games (400+ years). Scenario Ideas for LAN Parties
: Some users have successfully played by having the host start Steam in Offline Mode , launching the game, and hosting a local session, though this still often requires a Paradox account login for the "Invite Code" to generate.
Players pick Norse rulers in 867 AD. Coordinate massive, simultaneous Varangian Adventures or raids on Europe, dividing the spoils of war in real life. 3–5 Players Summary Checklist for Your CK3 LAN All PCs updated to the exact same CK3 version patch. Host possesses the desired DLCs to share with the room. ck3 lan multiplayer
: Joining a late-game session can take 10–15 minutes as the large save file transfers to clients, even on LAN. Be patient during the "Downloading Save" phase. Multiplayer Performance Tips CPU is King
: In the game lobby, the host can view and copy a unique Server ID (often a long alphanumeric string).
Everyone must have the same version of CK3 installed (e.g., v1.12.*), along with the same DLCs (optional, as the host’s DLCs are shared).
Setting up a LAN for CK3 is surprisingly easy, but it requires a few specific settings to ensure everyone can see the host. Enter the password if necessary and click Join
If the server doesn't appear, the host can provide their (visible in the host's lobby). Optimization & Stability Tips ("The Deep Piece")
Set pause rules to "Host Only" or implement a gentleman's agreement rule in the room. Unlimited pausing breaks the flow of real-time strategy.
All players must have the same DLCs active. If using mods, everyone must have the exact same load order Reddit user advice .
If your internet connection is down, you can still host a multi-day CK3 session with friends. Players pick Norse rulers in 867 AD
Here’s a practical guide to getting everyone into the same game.
No more relying on the cloud. You have full control over the save files. If you want to take a break and resume next week, you can simply transfer the file via USB stick or network share. It’s old-school reliability.
If the game says "Different Version" or "Checksum Mismatch," it means your game files do not match the host's.