Factorio Forums

I was wondering what controls when and where worms spawn.
Is there a place that controls at what evolution factor different worms appear? (or stop appearing)
Or is it something to do with base size?

Also, if I add a custom spawners and worms, with its own 'force', will the worms randomly appear at the vanilla bases also, and then as a result of the different force attack, or will the different forces group…
Thanks.

From what I know worms use same mechanics as bases - the perlin noise layer "enemy-base" with slightly adjusted peaks.
They are also created when enemies expand but thats a bit puzzling. I seen worms added by bob's mods spawned solo quite often as part of expansion I think.

If you want worms of different force you'd need to spawn them yourself I think.