Clash of Clans 10.134.12 for Android - Download
Vanquish your enemies and champion your clan onwards to glory
Divided into two completely different stages, you'll start out by building structures and hire citizens (yes, you do have to pay them). Later on, you get into real-time strategy battles where you show off your skills.
With ten different types of units, you build up your strategy by gaining experience and money. Defense systems must also be developed for your city, and are of vital importance if you expect to withstand the brutality of oncoming enemy attack.
Given its viral success, Clash of Clans is obviously a very entertaining game with classic management strategy gameplay that's far more unique than might initially be guessed. Moreover, it's completely free and totally optimized for Android.