The main plot hasn't changed. Jigsaw struck again. This time, he had eight youngsters locked in a room. Not knowing what to do and why they were locked in, they started doing things that cost their lives. Only two survived. But the real victim wasn't them, but the police investigator who never believed Jigsaw. Jigsaw promised the investigator that he would see his son, who was one of the teenagers who were locked in, if he would just sit and listen to Jigsaw. But of course, Dad has to do what he has to do, and that is saving his son -- that was the trap. In the end, the police realized that the video showing the teenagers in a room, was just a replay. But it was too late. The police investigator was locked in the same room where the two main characters in Saw I died. A sad ending. I was speechless after the movie. The writer must have used an extraordinary imagination to complete the story. The lesson: still the same as what part one suggested: PEOPLE WHO ARE AL