skjgi.zip is a release file of the Minecraft map battledome straight out, made for Minecraft 1.7.4. It was published on January 26, 2014 and is 1 MB in size. For the full description, screenshots and every other version, visit the battledome straight out map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.