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This time the game is directed at Officer Daniel Rigg (Lyriq Bent), who has always been obsessed with saving everyone and with finding Eric Matthews (Donnie Wahlberg), who has been missing for six months. Toward the start of the film, when they find the room with Detective Allison Kerry (Dina Meyer) in the trap, Rigg breaks protocol and enters the room before it has been secured, putting himself and the rest of the team at risk.Rigg receives a message from John Kramer/Jigsaw (Tobin Bell) saying that Eric Matthews is still alive and that Rigg can save him if he plays the game. Near Matthews sits Detective Mark Hoffman (Costas Mandylor), bound to a chair. Matthews is standing on a block of ice that is slowly melting and, if Rigg doesn't succeed, Matthews will be killed and the melted water will rush to Hoffman, electrocuting him. Rigg has 90 minutes to follow the clues and play the game. Jigsaw has also placed several other people in perilous situations: prostitute Brenda (Sarain Boylan), serial rapist Ivan Landsness (Marty Adams), and abusive husband Rex (Ron Lea) and his wife Morgan (Janet Land). In order to find and rescue Matthews and Hoffman, Rigg is told that he must curb his desire to save those individuals, either by leaving them to their fate or putting them in the position to save themselves. In doing so, he should learn what it means to truly save a life. Meanwhile, the FBI has become involved in the Jigsaw investigation. FBI agents Peter Strahm (Scott Patterson) and Lindsey Perez (Athena Karkanis) attempt to interrogate Jigsaw's ex-wife Jill Tuck (Betsy Russell), while looking for Jigsaw's second accomplice.

The Saw series of films -Lưỡi Cưa (2004), Lưỡi Cưa 2 (2005), Lưỡi Cưa 3 (2006), Lưỡi Cưa 4 (2007), Lưỡi Cưa 5 (2008), Lưỡi Cưa 6 (2009), Lưỡi Cưa 7 (2010), and Lưỡi Cưa 8: Di Sản Để Lại (2017)- all stem from an original screenplay by Australian screenwriters Leigh Whannell and James Wan (story). The screenplay for Saw IV was co-written by American screenwriters Patrick Melton, Marcus Dunstan, and Thomas Fenton.

Both Jigsaw and Amanda are dead. An autopsy is performed on Jigsaw, confirming his death. The bloody body of Amanda (Shawnee Smith) can be seen lying on floor in the operating room next to Lynn Denlon (Bahar Soomekh). The events in this film run parallel to the events of Lưỡi Cưa 3 (2006), so by the end of this film they are both dead.

In a flashback, a mysterious hooded figure is seen dragging Eric Matthews into a small room and closing the door. Eric is held prisoner there, with only a small opening through which he is given food. He reappears in Saw IV six months later to play his role in a game with Officer Rigg.

Yes. Flashbacks reveal that Jill was pregnant with John's child, until Cecil, (Billy Otis), a patient from her rehab clinic, caused her to have a miscarriage by accidentally slamming a door into her abdomen during a robbery. This is part of what leads John into becoming Jigsaw (the other part being surviving what should have been a fatal car accident after he was diagnosed with cancer). His anger turns psychopathic. Cecil actually plays Jigsaw's first game, where he has to push his face into some knives in order to release himself from a chair. If he remains in the chair, he will bleed to death from the knives cutting into his wrists. When Cecil makes it out of the chair alive, due the chair breaking, he immediately attacks Jigsaw with one of the knives. Jigsaw simply steps aside and lets him fall into a cage of razor wires.

The first one was made as a toy for Jigsaw's unborn son Gideon. He now uses Billy to be the "front man" on videotape when telling his victims the rules of a game.

We learn that Detective Hoffman wrote what was in the envelope and placed it in the drawer, but what is actually written in the note is not revealed until Lưỡi Cưa 6 (2009).

At the end of Lưỡi Cưa 3 (2006), it was revealed that Jigsaw had kidnapped Jeff's daughter Corbett. This leads into Saw IV, where Jeff is screaming "Where is my daughter?" before he is shot by Agent Strahm. Hoffman is seen (chronologically prior to that) with a brown teddy bear. When asked if he was married, he responds "I'm not. It's a short story, believe me." This teddy bear is for Jeff's daughter, hinting that Hoffman knows where she is. It is important to remember that, at the end of Saw III, Jigsaw stated that he is the only one who knows where she is. In the original script, however, after Hoffman locks Strahm in the room with the bodies of Jigsaw, Lynn, Jeff, and Amanda, he calls the police on the cellphone and tells them to get there. When they do, Hoffman emerges from the lair with Corbett and says that he saved her. Although filmed, this scene is not shown in Saw IV, but was instead used at the beginning of Lưỡi Cưa 5 (2008).

There is only a passing reference to Lawrence Gordon. His office sign is shown on the door where Jigsaw went for cancer treatment. Fisk also mentions to Hoffman that another doctor is missing from the hospital, referring to Lynn Denlon. Dr. Gordon's fate is revealed in Lưỡi Cưa 7 (2010).

Most of you saw a movie still of a man trying to escape a box of glass. It is presumed that this was Jigsaw's second trap and was deleted from the film. During the audio commentary for Saw IV, director Darren Lynn Bousman claims that the trap was used on the loud man in the hotel lobby, and that, since it has been shot, it will be shown in Lưỡi Cưa 5 (2008) (it's not). It was apparently cut from Saw IV because it was deemed too violent; it was also not in the original script and was created by Bousman because he was tired of shooting dialogue scenes. The box does appear in Saw V during the final trap, but in a very different context.

Segments of bone removed from the skull during brain surgery are most often reinserted and wired back in place. The brain cannot be left exposed; it must be protected either by replacing the bone, adding a plate, or requiring the patient to wear protective head gear.

This is the Spine Pincer; it is set to go off if he presses the release button for the detectives too early. Art's presence early in the movie is a classic red herring, a plot device used to mislead the audience: it suggests that he is Jigsaw's secret accomplice, until the device on his back reveals that he is also one of Jigsaw's victims.

The fourth installment of the franchise got an R rating for its theatrical release. This was also released on DVD and later Blu-ray disc as well as an unrated version that runs approximately three minutes longer. Looking at this cut one can conclude that the theatrical version was censored in many scenes.