The biggest fraction of the unique BioShock was, for me, the detection and searching of Rapture. Without the character of Rapture -- and yeah, I do sense the city was a character of sorts -- BioShock would have been an okay revolver with quite cool story, rather than many people's game of the year. So now that I'm revisiting Rapture in BioShock 2 (which I lately played for about an hour), I find myself marveling if the final game will direct to engage me in sufficient new ways to create it a creation that stands on its own, rather than one that tries to put pieces on the hand-me-downs from its big brother.