Here's the overview: http://unity3d.com/support/documentation/Manual/android-GettingStarted.html But you are probably looking for this: http://unity3d.com/support/documentation/Manual/android-sdksetup.html After you follow the SDK setup you just go to your Build Settings, switch to Android, and build like normal. It really couldn't be any simpler than it is, but let me know if you have any more issues and I'll help where I can.