OK, so the novelty has slightly worn off, but Darren Lynn Bousman's sequel is just as deliciously twisted, fiendishly clever and gruesomely gory as the first life-or-death-game instalment. Eight people imprisoned in a booby-trapped slum by Jigsaw (a remarkable Tobin Bell) must discover their association to unlock the antidote to a poison gas that's gradually killing them. The son of burnt-out detective Donnie Wahlberg is one of the victims, but Wahlberg apprehending Bell's cancer-ridden madman turns out to be just another devious part of a much grander master plan. This movie connects neatly to its unnerving predecessor in cunningly wicked ways - once more it's the imaginatively brutal torture contraptions and diabolical demises that delight and disturb. Guns, syringes and razor blades are among the instruments of pain contained within the pulse-pounding set pieces that this nascent fear franchise has made its own.

The chilling and relentless Jigsaw killer returns to terrorize the city once again. When a gruesome murder victim emerges with unmistakable traces of Jigsaw's sinister methods, Detective Eric Matthews is thrust into a high-stakes investigation. To his surprise, apprehending Jigsaw seems almost too easy, but what he doesn't realize is that being caught is merely another piece of Jigsaw's intricate puzzle.