Valheim Multiplayer & Upkeep Guides

Setting up a server? Read the co-op guide. Updating your version? Check the old-save page first. Hit a mod problem? Protect your data before you start diagnosing. None of these guides ask you to delete a live world just to test something, or to buy a particular hosting service.

Pick a guide by problem

• 

  Valheim Co-op: Host, Crossplay and Servers

  Choose between a host-run session and a dedicated server, run a join test, work through connection problems, and set co-op rules a long world can survive.

  v1.0.12
• 

  Valheim 1.0: Restart Your World or Keep It?

  Which old saves still work, where new content can generate, and how builders, returning players and achievement hunters should each handle the 1.0 upgrade.

  v1.0.12
• 

  Valheim Mods Broken After Update: What to Do

  Handle launch failures, missing items and multiplayer mismatches with backups, a vanilla test and staged restores, with no unverified compatibility claims.

  v1.0.12

Scope

These guides assume vanilla standard survival. World modifiers, mods and later patches can change how things behave. Every page keeps its source links and check date, and combat plans are first-playthrough advice, not the only solution.