The online mode is technically part of a free update called , but there are some requirements to get it running:
Binding of Isaac: Rebirth Repentance+ free DLC update is live! The Binding of Isaac: Rebirth online
Whether you’re a seasoned veteran with a "Dead God" save file or a newcomer looking for a reason to jump in, here is everything you need to know about playing Isaac online. How to Access Online Multiplayer The online mode is technically part of a
: You can finally earn those elusive marks on your post-it notes while playing with friends. The Binding of Isaac: Rebirth online
: Once installed, a new "Online" option will appear on the main menu. Key Features of the Online Update