Rooms.zip is a release file of the Minecraft map Rooms: The hardest maze in Minecraft, made for Minecraft 1.4.7. It was published on March 10, 2013 and is 2.9 MB in size. For the full description, screenshots and every other version, visit the Rooms: The hardest maze in Minecraft map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.