A_New_Kind_of_Challenge.zip is a release file of the Minecraft map A New Kind of Challenge, made for Minecraft 1.5.0. It was published on March 14, 2013 and is 1.8 MB in size. For the full description, screenshots and every other version, visit the A New Kind of Challenge map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.