Microsoft built its new campus in Minecraft to introduce employees

Four years ago Tuesday, Microsoft closed its $2.5 billion acquisition of Mojang, developer of the video game Minecraft. It was Satya Nadella's first multibillion-dollar deal since taking over as CEO in February 2014.

As it turns out, Minecraft had more to offer Microsoft than just a wildly popular game with 91 million monthly active users and 250 million downloads. The technology is now being used to help employees get acquainted with a refresh of Microsoft's sprawling campus in Redmond, Washington.