I only played it on the PS2. I beat it in 'bout 15 hours and like a lot of people, if I had to do it again I could probably run through it in 10 hours or less, I spent a lot of time figuring out some stupid puzzles, killing people in the right order and in the right time since there is no quick save on ps2. In the CIA building, I think it was, where you couldn't kill anyone 'cause they were friendly, I could have saved about 2-3 hours if I realized that I could have turned off a light switch and then take people down rather than going kamakazi.