I just started the AVN "SurvivalGuide-Day12" and gave up frustrated since I died several times because I could not shoot the attacking infected. I tried to aim the gun but there was only a message "focus" but aiming, moving and clicking the mouse did not produce the results needed. The gun did not fire and I died. I found no description how to act. So I decided to give up and delete the game. If someone could help me and explain to me how to fire the gun I would give it another try.