Don't get me wrong. You can always come and go as you please in all 4 chapters. I'm speaking strictly about main storyline. And you are right about the chapters. They really don't make any difference at all so I hope I didn't overstate the matter. Bottom line: Maximum freedom 100 percent of the time, all the way from start to finish. I never did have the bad stuttering and frame rate issues that someone (was it you?) asked me about earlier in the thread. Certainly nothing pronounced or noticeable. The game is a masterpiece albeit a little bit of a flawed one.