Zion Tower Defense android game free download

Tower Defense. In this interesting game you will have to protect Zion, a huge underground city with several levels. This is the last city remained inhabited with people; the others were captured by machine armies. They have found the way to Zion; the number of machines intended to destroy it constantly grows. Defend it or the humanity will disappear. Each wave of enemies is a peculiar puzzle and you have to solve it, using tactics and big guns! Restore the damaged towers and upgrade them after the each attack of the robots. Unlock 18 achievements.