Heroes Vs Zombies is an online mobile game, war game that mixes strategy with real time action, in which you will hire Heroes as mercenaries, and eliminate zombies units to collect free gold and war goodies, is free to play on Android devices, from ServeSilicon Technologies.
Download the game at:
https://play.google.com/store/apps/details?id=com.servesilicon.heroes.vs.zombies