The Green April

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

Official Synopsis
At the end of the first round of the Crown Game, Anaak, wielder of the ever-changing sword "The Green April," sits upon the throne. Bam, Khun, and Rak wait for the right moment to participate. Will they survive until the end of this bonus game?

Detailed Summary
Adapted from crunchyroll recap.