It's been barely 48 hours since Google's brand new Play Games management system went online, and already dozens of high-profile games have been updated to include its features. But how do you tell which titles use Play Games and which don't when browsing the Play Store (without, you know, actually reading the descriptions)? The big G has you covered. Badges for the various features of Google Play Games are now automatically appearing in the relevant Play Store pages.
App tearer-downer extraordinaire Ron Amadeo spotted this feature in his leak teardown, though the lower right corner badge doesn't seem to be implemented yet.