-you just can not beat the missions alone passed normal! - entering the dead factory is nearly impossible!!! - your entire team is dead before you even get the chance to enter, thers no turning back either!-IF you try your doomed to fail the turrets will cut you in half in seconds!-its no problem sniping all the umbrella agents and taking out the zombies, it just seems that the turrets can even shoot through the wall if your hiding!