Cube (2021)

A man awakens in a cube-shaped room, each wall of which is a hatch connecting to adjacent rooms. Upon entering another room, razor-sharp beams suddenly extend from the walls, killing him.

Engineer Yuichi Goto wakes up in a similar room alongside middle school student Chiharu Uno and freeter Shinji Ochi. They are all wearing identical jumpsuits, with their possessions gone and no memory of how they got there. A fourth, mechanic Hiroshi Ide, who has been navigating the maze, enters and warns them that some rooms are booby-trapped. Mathematics teacher Asako Kai also joins the group. When Ide opens a hatch in the ceiling, the corpse of the man from the first scene drops in. Deciding to work together to find an exit, the group begins traversing the rooms, with Ide using a boot as a decoy to test for traps. They encounter corporate executive Kazumasa Ando, who joins them.

The group enters a room where their only option is to go through the door. When Goto freezes midway through in fear, Ide pushes him aside and opens the door for the others. Uno has memorized the numbers between the rooms he passed through and uses a button to scratch them onto a panel. Goto theorizes that the rooms with thresholds including prime numbers contain traps, and he and Uno work together to calculate which rooms are safe to enter.

The group enters a room where all exits appear to be trapped. Ide discovers that one room's trap is sound-activated, and they carefully pass through it in silence. However, Ochi accidentally causes a noise, triggering the trap and injuring Ando's leg. Ando becomes enraged at Ochi. They grow confused when a room without prime numbers is still trapped and they return to the room with the corpse, leading them to suspect that the rooms themselves are moving.

A tremor causes Uno to fall into a room with a laser trap. Goto and Ide attempt to rescue him and succeed, but Ide is killed in the attempt. With Kai's assistance, Goto realizes that the numbers on the plates correspond to Cartesian coordinates which can be used to locate the exit. Metal bars extend from the floor, separating Ochi and Ando from the others. Ando decides that he and Ochi will find the exit on their own and part ways with the others. Goto, Kai, and Uno reach a room with a screen that displays Goto's memories of his younger brother Hiroto, who committed suicide to escape their abusive father. Distressed, Goto is consoled by Uno and becomes determined to protect the others. Meanwhile, Ando continues to bully Ochi, culminating in Ochi killing Ando by repeatedly slamming his head in a hatch door.

Uno calls Goto a coward for not saving his brother and threatens to jump in an unchecked room. Spurred on by his memories of failing to save Hiroto, Goto catches Uno at the last moment and sees that, like Hiroto, Uno's arms bear bruises from physical abuse. Kai tells them they have reached the edge of the cube, and they open the door to find their cube is part of an enormous structure, and they are over 50 meters up on its side; far from the distant opposite side with what seems like an exit. Ochi rejoins the group, claiming that Ando died in a trap. Suspicious, Uno confronts Ochi, who then attacks him. The others save Uno, and Ochi admits to killing Ando and deliberately leading them into a trapped room. As the trap activates, Goto fights off Ochi, who is killed by the trap. Goto sacrifices his chance to escape to ensure that Uno and Kai reach a room moving toward the exit. Uno and Kai reach the edge of the cube. Kai insists on staying behind to search for more survivors, and Uno exits the cube through a passageway leading to a light. Wounded, Goto continues to navigate the cube, determined to find a way out. It is revealed that Kai is cybernetically monitoring the survivors as part of an experiment and re-enters the cube to begin the process anew with a different group.