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Cube

A man named Alderson awakens in a room that has hatches on each wall and floor, each leading to other rooms. He enters another room and is killed by a hidden wiretrap.

Five different people all meet in another room: three men (Quentin, Rennes, and Worth), and two women (Leaven and Holloway). Quentin warns the group that he has seen traps in some of the other rooms. Leaven notices each hatch has plates with three sets of numbers etched into them. Rennes tests his theory that each trap could be triggered by detectors by throwing his boot into a room, and starts moving through the safe rooms. This works for motion detectors and pressure sensors, but fails to trigger the trap in one of the rooms and he is killed by an acid trap.

Quentin believes each person was chosen to be there. Leaven hypothesizes that rooms whose plates contain prime numbers are traps. They encounter a mentally disabled man named Kazan, whom Holloway insists be brought along. Tension rises among the group, as well as the mystery of the maze's purpose. Worth admits to Quentin he was hired to design the maze’s shell and guesses that The Cube was created accidentally by a bureaucracy, and that its original purpose has been forgotten and that they have been placed inside only to justify its existence.

Worth's knowledge of the exterior dimensions allows Leaven to calculate that the Cube has 17,576 rooms, plus a "bridge" room that would connect to the shell, and thus, the exit. She realizes that the numbers may indicate each room's coordinates. The group travels to the edge but realize every room there is a trap. They successfully traverse a room with a trap. Holloway defends Kazan from Quentin's threats.

The group reaches the edge, but can see no exit. Holloway tries to swing over to the shell using a rope made of clothing. The Cube shakes, causing the rope to slip; Quentin catches it at the last second and pulls her up, but then deliberately drops her to her death, telling the others that she slipped.

Quentin picks up Leaven and carries her to a different room in her sleep, intending to abandon Kazan and Worth. He tries to assault her, but Worth follows and attacks him. Quentin counters savagely, then throws Worth down a hatch to a different room. Upon landing, Worth starts laughing hysterically; Rennes's corpse is in the room, proving they have moved in a circle. Quentin is horrified, but Worth realizes the room Rennes died in has now moved to the edge of the maze, meaning they haven't gone in a circle at all. Instead, the rooms are moving, and will eventually line up with the exit. Leaven deduces that traps are not tagged by prime numbers, but by powers of prime numbers. Kazan is revealed as a savant who can calculate factorizations in his head instantaneously. Leaven and Kazan guide the group through the cube to the bridge. Worth then traps Quentin in a hatch. He catches up and attempts to attack them, but Worth opens a hatch under him from the room below. All but Quentin travel to the bridge where they open the hatch, revealing a bright light.

Quentin reappears and, using a detached door lever, severely injures Leaven and Worth. As Quentin pursues Kazan through the exit, Worth grabs Quentin's legs, trapping him in the bridge’s doorway. The bridge moves, killing Quentin. As the bridge returns to the recesses of the cube, Worth crawls to a fallen Leaven as he too bleeds out. Kazan wanders out into the light.