i tried to make a "realistic" apocalypse just to see how well i would fare... that meant normal amount of sprinter/ average strenght/good hearing zombies that can open doors... so as soon as i spawn, i look for a weapon, find a gun with 20 ammo, but a zombie saw me trough the window. I shot it... i killed 16 zombies total, and there where about 5 still alive gnawing on my face... i lasted 1 hour.