Apple's new "iCloud Private Relay" breaks Gorebox multiplayer.
A less common but more stable fix is a third-party mod (usually found on GitHub) that rewrites the netcode entirely. This mod forces the game to use deterministic lockstep (like fighting games) to stop the desync. gorebox online fix
If none of the above steps work, you might need to contact GoreBox's support team. Look for a "Contact Us" page or support ticket system on their official website. Provide them with as much detail as possible about your issue. A less common but more stable fix is
The developer pushes frequent updates to the Gorebox Beta branch. If you are on version 1.2.3 and your friend is on 1.2.4, the "Online" button will be grayed out. There is no auto-rollback feature. If none of the above steps work, you
This is where the term "Online Fix" enters the lexicon.