In the Google developer console it says "Google Play game services let you add social gaming features to your games on Android, iOS and the web."
So I am assuming it works on windows phone and blackberry? Has anybody tried?
Nevermind... the plugin doesn't work for mobile platforms yet...
Unfortunately at this time Google Play Game Services only work from a web browser. It does not currently work from Crosswalk or any non-browser wrappers like CocoonJS or Ejecta. However it should still work on mobile browsers such as Chrome for Android. ~ https://www.scirra.com/manual/175/google-play
Develop games in your browser. Powerful, performant & highly capable.
Also it may not even work for web since it requires a 'secret' now as well.