Harder than Diamond.zip is a release file of the Minecraft map Harder than Diamond, made for Minecraft 1.8.7, 1.8.4, 1.8.8, 1.8.3, 1.8.6, 1.8, 1.9-Snapshot, 1.8.2, 1.8.5, 1.8.1. It was published on November 14, 2015 and is 13.6 MB in size. For the full description, screenshots and every other version, visit the Harder than Diamond map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.