Seed finder

Valheim generates a world from its seed alone, so every distance on this page was measured by running the game's own generator rather than by exploring. We port the world generator to WebAssembly, run the full location placement for a seed exactly as the game does, and record how far spawn sits from each boss altar, Haldor, every dungeon type and the rest. 15,023 worlds are in the corpus so far, all on the 1.0 build.

Placement has to run in full to be right. The game places location types one after another, and each one consumes randomness and marks zones as used, so a shortcut that skips the types you do not care about moves everything that comes after them. Boss altars and traders survive that shortcut because they are placed first, which is why most seed lists only quote boss distances. Burial chambers, Mörkhalla and bear caves do not, so this scan pays for the whole pass.

Every hit opens in the seed map, which regenerates that world in your browser from the same code. If a number here looks wrong, the map is the check: it draws the terrain and the markers rather than reading them back from this index.

One caveat worth stating plainly. The corpus is a sample, not every seed that exists, so a query with several tight requirements at once can come back empty even though such a world is out there. That is a limit of the sample size, not a claim that the seed does not exist.