Multiplatform Game-Center
<p>To build an app where we want to use some integration with Facebook, multiple opponents, achievements and stuff... we are looking for the best way to do this.</p>

<p>Now, Apple has there game center which won't works with Android same will probably hold with for the Google counter part. What are the best alternatives for building such a system and/or implementing one in an Android and iOs environment? </p>
