Different and Yet the Same.

Unlike Apple's Game Center application, what Google's offering is backend support for developers rather than a standalone application. Think of it more like OpenFeint than Game Center -- you can sign in using your Google+ login in-game, and that login will track your identity (including leaderboard scores, achievements and saves) across various games and devices.

Forgive me if I'm being dense, but what part of that is "unlike Apple's Game Center"?

Source: http://www.engadget.com/2013/05/15/google-...