Attacks on your state and you are guaranteed to be perfectly aware of this and are ready to meet the enemy at the gates of his kingdom. It soon becomes for the machine gun fire, and begin to act until near your location is not got a huge number of enemies. Try to shoot accurately, because the enemy can be eliminated only with the tenth time. If you make closer to you the whole army of the enemy, they will destroy you to the ground, and then the game will have to start anew. Each level gives you upgrade the tower, proceed!