"Curiosity - What's Inside The Cube" (to give it its full title - the subtitle was added to avoid confusion with the Mars rover) is part massively multiplayer online game, part social experiment and completely and utterly insane. The free app is available for both iOS and Android devices and when you first start it up you see a gently rotating cube (rather like a Borg ship), floating in a white room. You can spin the cube, pinch to zoom in and out and a tap will take you right into the surface of the cube. As you zoom in, you start to see the individual pixels of the image on the surface. But then it zooms you in further, revealing the pixels that make up the pixels of the image. And then again. When you are zoomed all the way in, each of these pixels becomes a "Cubelet" and the idea of the game is to chip away these cubelets with a tap of your finger.

Yup, that's it.

Apparently there are 64 billion cubelets in total, making around 2,000 layers, and each layer must be fully removed before the next layer becomes available. At the time of writing, the first layer had just gone - with over 100 million cubelets - and it took about a day to do it. If the last cubelet is really the center of the cube, we could be here a while.

The one person who chips away the very last cubelet wins the as yet unspecified, but supposedly life-changing, grand prize.

http://www.wired.com/geekdad/2012/11/curiosity-killed-the-app/