Can only speak for PlayStation 2 games (I also worked on PS3 and XBox 360 but didn't handle that part). Sony's Technical Requirements were a pain. We had to build a freaking complicated State machine to handle all save scenarios (PS2 still used those external things to save games, you had to handle the user taking it out midsave, put back, etc). We had a game rejected for having a SINGLE space between PlayStation and that registered trademark symbol.