UHC1.1.zip is an alpha file of the Minecraft map Ultimate Hard Core, made for Minecraft 1.11, 1.11.1, 1.11.2. It was published on February 17, 2017 and is 3.1 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 Ultimate Hard Core map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.