Exit 8 (Japanese)

Based on the global hit eponymous video game created by KOTAKE CREATE, the mind-bending psychological thriller EXIT 8 is a haunting, cautionary tale.
A man becomes increasingly desperate when he finds himself trapped in an endless, sterile subway passageway with no way out. He finds a set of rules: do not overlook anything out of the ordinary. If you discover an anomaly, turn back immediately. If you don't, carry on. Then leave from Exit 8. When even a single mistake will send him back to the beginning, will he ever escape this purgatory?