The Biocube.zip is a release file of the Minecraft map "The Biocube", made for Minecraft 1.8-Snapshot. It was published on July 31, 2014 and is 6.6 MB in size. For the full description, screenshots and every other version, visit the "The Biocube" map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.