How do I resolve the "World Sync Failed" error in multiplayer?

The ''World Sync Failed'' error in Valheim multiplayer is a common issue that occurs when the game fails to synchronize the world data between the host and the players. This can happen due to various reasons, such as network issues, corrupted save files, or mismatched game versions. Understanding the game mechanics and following a systematic approach can help resolve this issue effectively.\n\nFirst, ensure that all players are using the same version of Valheim. Game updates can sometimes cause compatibility issues, especially if one player has updated their game while others have not. To check the game version, go to the main menu and look at the bottom right corner. If versions differ, all players should update their game to the latest version available on Steam or their respective platform.\n\nNext, verify the integrity of the game files. Corrupted files can cause synchronization issues. On Steam, right-click on Valheim in your library, select ''Properties,'' then ''Local Files,'' and click ''Verify Integrity of Game Files.'' This process will check for any missing or corrupted files and replace them. Repeat this step for all players to ensure consistency.\n\nIf the issue persists, the problem might lie with the world save file itself. The host should navigate to the world save directory, typically located in ''C:\Users\[YourUsername]\AppData\LocalLow\IronGate\Valheim\worlds'' on Windows. Backup the world files by copying them to a different location. Then, try loading a different world to see if the issue is specific to that save file. If the new world works, the original save file might be corrupted and may need to be restored from a backup.\n\nNetwork issues can also cause the ''World Sync Failed'' error. Ensure that all players have a stable internet connection. If possible, use a wired connection instead of Wi-Fi to reduce latency and packet loss. The host should also check their firewall and router settings to ensure that Valheim is allowed through. Port forwarding might be necessary; Valheim uses ports 2456-2458 for multiplayer.\n\nAnother potential solution is to change the hosting method. If the host is using a dedicated server, try switching to a peer-to-peer connection, or vice versa. Sometimes, the server software might have issues that cause synchronization problems. If you''re using a dedicated server, ensure that the server software is up to date and properly configured.\n\nFor players experiencing frequent disconnections or sync issues, reducing the number of active players in the session can help. Large groups can strain the host''s network and processing power, leading to synchronization failures. Limiting the session to a smaller group of players can improve stability.\n\nFinally, if none of the above solutions work, consider starting a new world. While this might seem drastic, it can be a fresh start with no underlying issues. Ensure that all players are on the same page regarding the new world and its rules. This can also be an opportunity to explore different biomes, such as the Meadows, Black Forest, or Plains, with a clean slate.\n\nIn conclusion, resolving the ''World Sync Failed'' error in Valheim multiplayer involves checking game versions, verifying file integrity, ensuring stable network connections, and possibly changing hosting methods. By following these steps, players can enjoy a smoother multiplayer experience. Remember to back up your world files regularly to prevent data loss and always keep your game updated to avoid compatibility issues.