Play Magnus was ranked as number 1 in iTunes App Store Norway within the first 24 hours and reached almost 100 000 active users the first week. Making Waves built Play Magnus app using Xamarin and the “game center” using cloud services because we needed Play Magnus to handle millions of concurrent users. This session will focus on how you utilize cloud solutions that are robust enough to survive millions of active concurrent users in your own projects. We will show you examples used in Play Magnus to handle frequent traffic in your app. Furthermore, we will present the architecture for Play Magnus on Xamarin and cloud services using Azure Mobile Services, and a little bit about the chess engine.