Four days: World defense android game free download

Description:
Build different towers and protect your territory form the aggressors. In the world of this Android game high-tech robots are attaching you. You need to build towers with different weapons to destroy the enemy. Upgrade your towers as the time goes to increase their power. Combine the towers with different weapons to make your defense even more effective. Use special skills in critical moments of battle. Win and get achievements.

Features:

9 types of towers
5 difficulty levels
12 different maps