You will have to protect the inhabitants of your city and destroy all the Amongs. Your city will be visible on the screen in front of you. An army of monsters will march towards the gate. Special bows will be installed on the walls of the city. You will be able to lead them. You will need to calculate the trajectory and power of the shot and make it. If your aim is accurate then the arrow will hit the zombie and kill him. For this you will be given points. Having accumulated a certain number of them, you can purchase new types of weapons.