The goal of the game is to kill the creeps before they reach the end of the maze. In order to stop the garden pests you have to build Defense gadgets along the way of the invaders. Defense gadgets will fire automatically once the creeps enter the firing range of the turret. When you kill pests you receive small amounts of money, which you can use to build more Defense gadgets. Each creep and Defense gadget has its own unique characteristics. You can view them by selecting a Defense gadget and clicking on it. There are two types of creeps: Ground ones and Flying ones. Some Defense gadgets only attack ground creeps, others attack only flying creeps and some attack both. To
figure out which creeps a Defense gadget can attack move the mouse cursor over the build button of the Defense gadget and see the short description on the right hand side of the game screen.