The three major mobile platforms are iOS, Android, and Windows Phone. Each platform has its strengths and weaknesses in terms of performance, distribution, and marketing.

Before you begin publishing, make sure you have all UI elements scaling correctly at various resolutions. Using a canvas with the anchor and pivot points properly placed helps with this. Android has many more screen resolutions than any other mobile platform and it is impossible for you to test on all resolutions, so making sure everything scales appropriately is essential.

To publish on iOS, you final game must be built on a Mac. To publish on Windows Phone, you final game must be built in Windows 10. To publish on Android, your final game can be built using either a Mac or Windows operating system. So, to build to all three platforms you need both a Windows 10 machine and a Mac with a current OS.

Each of the mobile platforms require you to sign up for their storefront; none of them allow you to do...