The Silence Circle, Saw 3D.
The victim of this trap sat on the chair in the middle of a metal contraption. To prevent the subject from moving away, the person wore a straightjacket as well as a contraption, which held their head in place. The machine surrounding the victim consisted of a metal ring held up by four metal posts at approximately the same height as the victim's head. Attached to each of these posts was a pointy metal rod aiming at the victim's throat. To survive, the test subject had to rely on the help of a second person. Once the game began, this second person had 60 seconds to obtain the key, which could deactivate the machine. Otherwise, the rods would move forward and eventually pierce the first victim's throat. The key, however, was in the first victim's stomach, attached to a fish hook hanging from a wire. Within 60 seconds, the second subject had to pull out the key, thereby causing immense pain for the first person. Additionally, each one of the metal posts had a phonometer, which registered every noise in the room. Every time the decibel level in the room rose above a whisper, for example when the victim started to scream, the metal rods would move forward, thereby killing the victim even sooner.