Now deceased, Jigsaw carries on his legacy with the help of an unknown ally. With each of his friends and fellow officers that were involved in the case dead, Officer Riggs is selected as the prime target in the newest game. He must complete a series of tasks if he hopes to save Detectives Matthews and Hoffman, but is Jigsaw looking for a new victim, or a new recruit? Repeat viewings pay off in this fourth installment in the series, as each of Riggs' tests are cleverly foreshadowed in the dialog early on in the script. In keeping with the previous two entries, SAW IV plays around with the time line of events and intertwines more of the history behind Jigsaw's early development. Bousman differentiates the look of the film from the original trilogy through the use of warm color filters in place of the typical blues and greens, which may have been used as a visual metaphor or motif for the new killer. Each of the traps are as vicious as ever, producing more blood and severed body parts than ever while sticking with the crude, simplistic designs. Jigsaw's successor comes as a true shock in the film's twist ending thanks to a number of well-placed red herrings. SAW IV is a weaker entry in the series, but an entertaining and watchable one nonetheless.