To celebrate the release of ZombieSmash on Google Play, Zynga folks turned the giant Android robot on Google's campus into a giant undead Android robot, that may or may not want to eat your brains. This game, already available in the App Store, is a tower defense game where you flick and mash waves of zombies, keeping them away from the last known human survivor named Joey.
The Google Play version of this game is available for $0.99 for a limited time ($1.99 regular price).