Your territory is being attacked by enemy vehicles. Click on a tower on the right side of the screen, then click where you want to place the tower. Click on a tower you have placed then click on the + sign in the upper right corner to upgrade your tower. When you have 3 stars above a tower, it is upgraded as much as it can be. Place towers and upgrade them to keep the enemies out of your territory. There are 20 waves so you must pick the right combination of guns, place them in the right place and upgrade them the right way. Are you ready for some terrific fun? Great, then place your Tower Machines and see if you can win and protect your territory!