Wordament is a multiplayer, original word puzzle game and is available cross platform Xbox Live title with over 1,000,000 players which was developed by two indie developers.
To help you understand the opportunity of cloud connected games we have developed a three part series on MSDN,
The series goes into all the details on how the Wordament developers made this happen, using Azure as a backend, and Xamarin to take their native C# projects to other platforms.
Part I. Anywhere, anytime, any device: Wordament’s cloud architecture
Part II. Developing a cross platform app
Part III. Running a business