GTA IV: Ballad of Gay Tony is listed as silver on protondb, meaning 'works with tweaks', so that sounds about right. Things obviously aren't perfect. That last

GTA IV: Ballad of Gay Tony is listed as silver on protondb, meaning 'works with tweaks', so that sounds about right. Things obviously aren't perfect. That last 10% of games is a massive pain, since every game is different (all the ones that are well behaved are in the first 90% that already work).