Sony's PlayStation 4 cross-play feature is out of beta and now available to all developers

The cross-play feature is now open to any game that supports it.

PS5 receives version 7 update, featuring Discord integration and VRR support

PlayStation 4 system software - Wikipedia

Sony's PS4 4.5 update is out now. Here are its new features and how to download

Sony continues to lock PS4 players out of cross-console play

Developers Weigh in on PlayStation 4 Cross-Play

The PS4 Cross-Play Program Is Now Out of Beta, Says Report

Playstation 4's Cross-Platform Play Is Out of Beta - IGN Daily Fix

Sony, Microsoft and the great cross-gen debate

PS4 Cross-Play Exits Beta, Now a Full Feature For Developers

PlayStation 4 review: Sony's new console is great, but it needs more games - The Globe and Mail

Backbone One – PlayStation Edition launches on Android today – PlayStation .Blog

Cross-platform play - Wikipedia