A only mixture of strategy and puzzles! You must solve puzzle type bejeweled to be able to construct towers and to use them for defenderte of the bad ones.
The world-wide crisis has caused that the toxic remainders generate zombies! It tries to reconstruct the civilization and to fight to the not-die threat!
After an apocalypse of zombies, you are the one in charge to reconstruct the civilization, but they ten well-taken care of of not contaminating or the zombies are haran but strong!