world.zip is a release file of the Minecraft map thesever, made for Minecraft 1.6.2. It was published on August 20, 2013 and is 13.6 MB in size. For the full description, screenshots and every other version, visit the thesever map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.
