The Correct Door

The Correct Door is the third episode of Season 1 of the Tower of God anime.

Official Synopsis
When Test Director Hansung Yu announces the subject of the test, Rak throws a tantrum, and Bam calms him. Meanwhile, the gears in Khun's head alone are turning. Second by second, time moves forward. What will they do?

Detailed Summary
Adapted from crunchyroll recap.