State of Decay 3 multiplayer is best understood as shared-world co-op, not as an MMO unless official sources say otherwise.

This page collects the multiplayer facts that matter before launch and links to the more specific co-op and crossplay pages.

Confirmed multiplayer facts

FeatureStatusSource
Online co-opListedSteam
Up to four playersConfirmedXbox Wire
Cross-platform multiplayerListedSteam
Single-playerListedSteam

What remains unclear

The exact matchmaking flow, platform-pairing rules, account requirements, and host ownership model have not been fully explained. Those details should be tracked as official updates rather than inferred from State of Decay 2.