This version is the first version of «Defense zone», as it was before the advent of options HellFire ( temporary increase in power ) and the change balance levels of the game . Enjoy the increased complexity of all 10 levels for free. Description. Stunning detail of levels, in-depth gameplay, finely tuned balance of all levels and turrets. During the game you will hold your defence with your turrets against the massive hordes of enemies. With every level you will have the use of new weapons a