You have to make it through each day by protecting your fellow soldiers from terrorists and enemies! You are in the watchtower on the right side of the screen. Before the game starts, you have a chance to buy a weapon and upgrades. Move your mouse, which has a little plus sign to show where you are aiming. Click to fire when it is on an enemy. Kill enemies as quickly as you can. The longer enemies stay alive, the angrier they get and the more they want to kill you. At the end of each day, you can buy new weapons and upgrades.