1.9 is a beta file of the Minecraft map Ultimate Hard Core, made for Minecraft 1.11.2. It was published on October 20, 2018 and is 64.8 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.