Your objective in this first-person shooter game is to defend your base and stop any enemies from coming close. You will have snipers positioned at different points and you can switch between them to shoot your enemies. You need to clear entire waves of enemies to gain experience points and money that can be used to buy new weapons and upgrades. Once a wave of enemies is defeated, you commence to the next operation. Aim and fire using the mouse. Use space bar to zoom in and out. Q is for switching weapons and R is for reloading. 1,2,3,4 are for switching snipers.