Realtime Cube is an open-source, collaborative realtime demonstration app built on top of the Google Drive Realtime API. Launch the app from the Create Menu in Drive, and then share a cube with your friends to start solving the cube puzzle in a real-time, collaborative way. This app is fully open-source, and available on Github at https://github.com/googledrive/realtime-cube. Developers can use and adapt the source code as needed in their own collaborative applications. For more information on the Google Drive Realtime API, see: https://developers.google.com/drive/realtime/ For questions or comments, contact the Google Drive SDK Developer Relations team on Stack Overflow: http://stackoverflow.com/tags/google-drive-sdk/