Wither Arena Sky Island Survival.zip is a release file of the Minecraft map Wither Arena Sky Island Survival, made for Minecraft 1.12.2. It was published on August 1, 2018 and is 1.3 MB in size. For the full description, screenshots and every other version, visit the Wither Arena Sky Island Survival map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.