The robots have stolen our precious McGuffin! Intelligence suggests that it is being kept in a briefcase somewhere in their secret base. Infiltrate the base and recover the McGuffin by whatever means necessary!
Use the artillery to destroy as many enemy soldiers as you can. Blow up bridges, buildings and towers to complete each level. Try to collect as many stars as possible.
Enemies are approaching closer and soon they will reach your base. Stop them by strategically placing from defense armies to turret towers in their way.
We're under attack! Man the turret and shoot the creeps that are overwhelming the planet. Help is on the way but it'll take 100 more days. Can you survive till then?