CTG.zip is a release file of the Minecraft map Capture The Golem, made for Minecraft 1.11, 1.11.1, 1.11.2. It was published on August 25, 2017 and is 5.8 MB in size. For the full description, screenshots and every other version, visit the Capture The Golem map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.