It seems like Zombies are taking over the app store lately. A meteor has hit earth releasing Toxium into the air! Are you prepared to save the region. Biodefense, developed by Resolution Interactive AB, is a Tower game where the object is to ether complete one of the ten missions or stay alive as long as possible. The app includes OpenFeint leader boards and 25 unlockable achievements. Different weapons and enemies add to the suspense. The goal of the game is to destroy the headquarters from zombies. Your headquarters also acts as a Toxium collector.