Destroy all of your opponents and own their Zombie bases one by one. You will start with the blue one, capture the others by swiping the finger from blue base to another one.
The Main target of Overturn is to own all of the Zombie bases.
With the simplest control, Overturn provides players various strategies (Attack, Defense, Towers). Open your mind to build winning tactic: more Zombie bases are more chances to win.