The outbreak of the zombies has been a cause of serious concern for the Government. They really have no choice but to hire you, a mercenary to carry out the defense tasks. Your job is to guard certain areas as per the provided briefings. Putting to use all your experience and strategy making abilities, you will need to place the units in strategic positions to attack all the approaching waves of the evil and bloodthirsty zombies who will never show any sign of retreat. To give yourself the best chance of being successful, you will have to unlock the achievements and avail the upgrades the game has to offer.