1. Azure Mobile Services allow developers to add a cloud backend to their apps in minutes. It offers a free trial and plans for students and startups.
2. There are Unity plugins like BitRave and Prime31 that enable connecting Unity games to Azure Mobile Services. Prime31 is free and well documented.
3. The document demonstrates how to build a demo project using the Prime31 plugin, including downloading the plugin, adding an Azure Mobile Service, and creating a Unity project.