You play as a Kitty, and the object is to make it to the center of the map. You have to avoid the dogs, and make it to the end. Teamwork is essential, don't leave your team mates behind. When you die a circle appears on the ground where you died. You can be revived if one of your team mates runs over your circle.
This .zip file contains many versions of Run Kitty Run. In order for the maps to work, extract the files in to your Warcraft III downloaded maps folder.
(The default path is C:\Program Files\Warcraft III\Maps\Download)
Download it here!