Few games come with a manual like the original Fallout manual. (I lost mine to hurricane Katrina, though I still have the box
)
And a very nice box it is, back in the time where PC Game boxes were the size of microwaves.
Without the manual, how will you be able to cook your mushroom muffins?
Most today's manuals only serve to explain the game mechanics and nothing else, while most manuals in the 90's gave a lot of background information about the world you were about to get yourself immersed in. And sometimes they were written "in character" with misc notes handwritten at some places.
Ultima Underworld, Daggerfall, Arena, Baldur's Gate and Fallout are good examples of that.