The Diamond Challange Map.zip is a release file of the Minecraft map The Diamond Challange, made for Minecraft 1.8.3, 1.8, 1.8.2, 1.8.1. It was published on April 18, 2015 and is 15.5 MB in size. For the full description, screenshots and every other version, visit the The Diamond Challange map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.