Save your nation from destruction by completing a series of defense missions. Strategically build towers to eliminate waves of enemy soldiers before they destroy your castle. As you progress, new towers become available for you to build.
Aliens have landed and want to eat the farmers' brains! You must defend the barn. Strategically arrange the crop circles to make them follow a path of your choice. Then place your military assets and blast them back to space!
Defend against the robo-bugs that are trying to take over your base. Unlock and upgrade new areas and special weapons. Collect enough exp points to get more powerful weapons.
