whose files are used in a multiplayer run?

[Gandalf the Grey]

when i host a multiplayer run it looks like it uses someone else's save files or a randomly generated one, does anyone know what is actually happening?

[Dwarvin' Marvin]

I don't believe anyone actually knows, it's hard to reliably test what exactly is going on. But I'm guessing the game makes a hybrid save using only unlocks that everyone in the lobby has in common, outside of character unlocks like Isaac D6 or Maggy pill.

[Ajax Drinker]

Character unlocks are client's save, item unlocks are global.

[Gandalf the Grey]

Originally posted by Ajax Drinker:

Character unlocks are client's save, item unlocks are global.

what about things like alt path and other boss unlocks like beast? (im talking about unlocking the bosses themselves) because sometimes those arent unlocked in multiplayer yet i have them in my save file unlocked

[denyscrasav4ik]

AFAIK it uses the file with least unlocks

[Kippetje94]

Originally posted by denyscrasav4ik:

AFAIK it uses the file with least unlocks

Yes, this is the explanation. Online co-op always uses the file with the least unlocks. So if a person has a new save file you can only go to moms foot etc.

That's why I always asks which way we go when I play with strangers. That's how I know if I can even get the completion marks I need.