Clash of Clans is a management RTS. Here you found a village where the members of your fearless clan can live. Then, send them out into the world facing missions to prove their courage and destroy enemy camps.
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.