Episode 20 is a beta file of the Minecraft map ClassicDuff - GreedyCraft World Download, made for Minecraft 1.12.2. It was published on March 7, 2021 and is 169.5 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the ClassicDuff - GreedyCraft World Download map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.