23. Fallout: New Vegas
Though not part of the main entries in the Fallout series, Fallout: New Vegas is a killer apocalypse simulator that takes the struggle for survival all the way to a dilapidated Sin City. Familiar sights and sounds pepper the landscape, but there no Vegas showgirls to be found here. The glitz and glamour has faded, but at least you've got your Pip-Boy to keep you company.