Your base is under attack! Get your best chopper out there immediately and demolish every enemy unit on sight. Don't forget to build towers and repair damaged towers to help accomplish your mission.
Stop the invasion before the enemy reaches our cities! Alien life forms have been detected and our army has mobilized its defensive tower forces to protect us.
Fight an infection present in human body. The first battle takes place in the nose. All towers produce units slowly over time. To get more units, you need to claim more towers and make them your own. Take over all enemy bases to complete each level.
