Portal is dead with crossplay off, I'm so seriously underwhelmed by the fact they thought crossplay with PC is a good idea. I'm actually astounded that a game developer thought this is
Portal 2: Pretty Much Every PS3 Question Answered (and that Cake thing, too) – PlayStation.Blog
Portal 2 PS3 Edition To Have Cross-Platform Play, Other Steam Features | TechCrunch
Portal 2 gets cross-platform play across PC, Mac and PlayStation 3 | WIRED UK
List of all Playstation 3 cross-play games currently available.
LittleBigPlanet 2 with Vita cross-play is Sony's answer to Wii U and SmartGlass - Polygon
Sony: PS4 and PS3 cross-platform gameplay 'technically possible' | TechRadar
Steam Details for Portal 2 on PS3 RevealedPS3Blog.net
Portal 2 Details About Cross Platform Play on PS3 | Attack of the Fanboy
Sony details PS3/Vita cross-play compatibility - SlashGear
Steam for PS3 Portal 2 detailed - GameSpot
Cross-Play Is the Right Move for Gaming, But Even Better For Microsoft | USgamer
Portal 2 to be cross-platform, PS3, PC and Mac | TweakTown
Valve plans PC and PS3 cross-platform play for Portal 2. But would r/PC and r/PS3 play nice? : r/gaming
PS3 With PS4 Cross-Play Video Games
Portal 2 - PCGamingWiki PCGW - bugs, fixes, crashes, mods, guides and improvements for every PC game
Games That Support Cross-Play (2021 Edition) | Double D-Pads
PC, PS3 Owners Can Play Portal 2 Together | WIRED
Breaking: Portal 2 on PS3 Features Cross-Platform Play! - Gaming News - GameFront