a United Nations program devoted to urban planning in countries affected by poverty or natural disasters began developing a sports field in the slums of Kibera, Kenya, designing it in the popular sandbox video game Minecraft. The game, which allows players to build entire worlds out of cubes in a 3D environment, helped the project leaders create a visual representation of the field that could be easily understood by the neighbourhood's residents.

http://www.smh.com.au/digital-life/games/changing-the-world-through-video-games-20140421-zqxiz.html