The goal of this fame is to kill all hostiles without being shot. There are certain numbers of hostiles per level. If you kill a hostile per shot you will gain maximum bonuses. Headshots are the easiest way to kill a hostile. Also get as many powerups as you can to restock on ammo and health. You have 3 guns to choose from. There is also a timer that you have to be aware of. Use YOUR MOUSE to aim and click LEFT MOUSE BUTTON to shoot. To cover and reload hit SPACEBAR. Press "1", "2", "3" KEYS to choose weapons. Good luck!