LogFAQs > #972250706

Multiplayer opens up once you reach the first major town. Other players are just doing their own thing, but if you're both on the same quest you end up working together naturally as you walk towards your objective.

Seems like everyone's loot is independent so whatever drops is exclusive to you and they can't see it

if any of this was in Diablo 3 I only played that game once a decade ago and remember almost nothing from it so I apologize.

also the entire map just being one interconnected sandbox is really cool and different from what I'm used to in Diablo 2

not sure if this map is just act 1 though or if it's the entire game because it seems REALLY BIG just to be Act 1