What was Saw 4?

lol your never meant 2 truely get saw films, the main guy in saw 4 came was the cop in saw 3, there were 2 different bodies because he planted one in the hospital, if u look back only he touches the body and knows exactly where the tape is, the plot is always on going, although i dunno whats happens 2 that little girl??? that guys daughter who was in the end of saw 3??? do u??