Portal 2 on PS3 was the only Valve game on console to be cross play and cross progressions with PC via logging into steam on your PS3 and you'd get steam achievements +
Helldivers coming to PS4, PS3 and Vita with Cross-Play | Engadget
Sony: PS4 and PS3 cross-platform gameplay 'technically possible' | TechRadar
Games with crossplay on PS3 - cross play games · Crossplayable Games
Rogue Legacy reborn with cross-platform features on PS3, PS4 and Vita July 29 - Polygon
PS Vita and PS3 Cross Platform Features Explained | XTREME PSVita
Games with crossplay on PS3 - cross play games · Crossplayable Games
Does GTA Online have crossplay? PC, Xbox, & PS5 cross-platform info - Charlie INTEL
PC/PS4/PS3 CrossPlay Now Available In DC Universe Online; Here's How It Works
Is Terraria Cross Platform in 2023? [Latest]
Best crossplay games: play with friends across platforms | TechRadar
Games with crossplay on PS3 - cross play games · Crossplayable Games
Borderlands 3' finally adds cross-play support for PlayStation consoles
Sony: PS3 and PS4 cross-play is 'technically possible' (update) - Polygon
PS3 & Vita Cross-Play Games - Giant Bomb
PlayStation Vita & PS3 cross play | trailer (2012) - YouTube